OPINION
ZLAKET, Justice.A hearing committee has determined that respondent is guilty of multiple ethical violations. The disciplinary commission agrees. Both have recommended disbarment. We have jurisdiction pursuant to Rule 53(e), Ariz.R.Sup.Ct.
Mr. and Mrs. R retained respondent to represent them in a landlord-tenant dispute. The ease went to trial in November 1988. It resulted in an $86,500 judgment in favor of respondent’s clients and a $2,500 judgment against them on a counterclaim. One month later, the attorney for the opposing parties made a written settlement offer of $18,000 to respondent, who rejected it. Respondent thereafter turned his entire file over to the clients’ appellate attorney, who shared an office with him.
In November 1989, the court of appeals reversed the verdict for Mr. and Mrs. R but left intact the judgment on the counterclaim. Respondent subsequently received a demand letter from the adverse parties’ appellate attorney, which contained a general reference to the previous settlement offer.1 He forwarded it to his clients, retaining a copy for their file.
In May 1990, Mrs. R had a telephone conversation with respondent, which she taped at the request of a police officer who was investigating her claim of a complex “conspiracy” involving respondent, the defendants, and possibly opposing counsel in the underlying lawsuit.2 During this conversation, she asked respondent about settlement offers made before the appellate process began. He replied that there had been only one tentative oral offer in the approximate amount of $10,000. At the close of this discussion, Mrs. R asked if she could pick up-the rest of her papers, and respondent agreed.
The clients apparently got the file from their appellate attorney, although it is unclear exactly when or by whom it was obtained. It contained both the written settlement offer and the subsequent demand letter referencing it. Neither respondent nor the appellate attorney retained a copy of the file.
In September 1991, Mrs. R filed a complaint with the state bar, alleging the aforementioned conspiracy. She further claimed that respondent never communicated the $18,000 settlement offer to her or her husband. The bar pursued only the latter allegation.
Respondent denied all charges. He maintained that the offer had been communicated to the clients at a meeting in his office, during which he also explained the appeals process, anticipated costs, and the likelihood of collecting the original judgment. To corroborate his story, he offered an affidavit *453signed by his secretary. Mr. and Mrs. R claimed that such a meeting never took place. Mrs. R could not recall whether she ever discussed with respondent any of the other topics he said were covered during the meeting. Her husband remembered that detailed information was provided about the appeals process, transcript costs, a bond that the opposing party would have to provide, and the prospects of collecting on the judgment. When asked where these subjects were discussed, however, he was unable to say.
I. Failure to Communicate the Offer
Mr. and Mrs. R both testified that respondent never told them about the written settlement offer. The hearing committee concluded that their testimony was credible and “supported by the overwhelming evidence in the case.” Conversely, respondent and his secretary swore that he did convey the offer, but they were not believed. The committee determined that respondent’s taped telephone statements supported the clients’ version of the facts and were clearly inconsistent with disclosure of the written settlement offer.
The committee was also influenced by the absence of corroborating evidence. There was no correspondence reflecting transmittal of the offer to the clients (respondent claiming he handed Mrs. R a copy in person); no appointment calendar showing the alleged meeting (respondent explaining that he discarded his old calendars when he relocated his office); no phone records or bills documenting the calls allegedly made to set up the appointment; and no notes in the file about the purported meeting. With respect to the last item, respondent maintained that someone had removed his notes from the file, most likely while it was in the clients’ possession.
The committee concluded that respondent failed to communicate the settlement offer to his clients, in violation of ER 1.2 and ER 1.4. The commission agreed. We believe the evidence was sufficient to support this conclusion.
II. Misrepresentations to the Bar and Committee
Both the committee and the commission found that respondent intentionally lied during these proceedings in an attempt to conceal his failure to communicate the offer. They further determined that he knowingly encouraged at least one member of his secretarial staff to make false statements. Each concluded, therefore, that respondent engaged in dishonest conduct in connection with a disciplinary matter, in violation of ER 8.1 and ER 8.4. Neither the committee nor the commission offered any explanation for such findings other than that respondent and his witnesses were not believable.
Although this court is the final arbiter of law and fact in disciplinary cases, In re Loftus, 171 Ariz. 672, 674, 832 P.2d 689, 691 (1992), we normally defer to the findings of the committee, especially in matters of witness credibility, In re Kersting, 151 Ariz. 171, 172, 726 P.2d 587, 588 (1986). We must, however, be satisfied that they are supported by clear and convincing evidence. - Rule 54(c), Ariz.R.Sup.Ct.; In re Jones, 169 Ariz. 19, 21, 816 P.2d 916, 918 (1991). We accept the committee’s finding that respondent’s explanations were unpersuasive. However, lack of credibility is not always the equivalent of intentional dishonesty. Judges and juries often disbelieve witnesses, but that does not necessarily give rise to findings of perjury.3 Humans are forgetful, make mistakes, and get confused. As one committee member observed in answer to respondent’s suggestion that Mr. and Mrs. R were lying, based on inconsistencies in their stories, “[I]t is impossible to categorize people as intentional prevaricators or people that simply *454have bad recollections.” Hearing on Motion to Reopen, October 19,1992, at 20. The fact that a witness is not believed does not, standing alone, constitute clear and convincing evidence of intentional fabrication.
We believe the record is insufficient to support the conclusion that respondent intentionally lied. The explanations he offered were at least plausible, if not convincing. Moreover, we note that respondent refused to change his story even after members of both the committee and the commission essentially told him it was his only hope of avoiding serious discipline. Finally, respondent made no attempt to destroy or hide from his clients the letter referencing the offer he supposedly knew that he never told them about. He not only mailed it to them but had a copy placed in their file. He made no effort to remove it, even after Mrs. R told him she intended to pick up all her papers. He also left the original written settlement offer in the file.4 It is therefore understandable that two members of the commission were unwilling to accept the finding that respondent intentionally deceived the committee, even though one of them agreed that he was not credible.
We distinguish In re Fresquez, 162 Ariz. 328, 783 P.2d 774 (1989), and In re Fioramonti, 176 Ariz. 182, 859 P.2d 1315 (1993), where the evidence was uneontroverted that the attorneys had lied to the committee and commission. In Fresquez, the attorney was accused of 1) preparing and having his client sign a back-dated letter recanting the bar complaint and 2) having his secretary sign a false affidavit stating that she had mishandled that complaint. Fresquez, 162 Ariz. at 329-31, 783 P.2d at 775-77. He initially denied any involvement with the client’s letter, later stated that perhaps someone on his staff had helped prepare it, and finally admitted doing it himself. Id. at 330, 783 P.2d at 776. He also admitted that he had drafted the affidavit without consulting his secretary and thereafter requested that she sign it. Finally, he conceded that she had never even seen the bar complaint: Fresquez Hearing Comm.Trans., Jan. 30, 1988, at 165-66. In Fioramonti, the attorney admitted creating and back-dating file notes and soliciting false affidavits. Fioramonti, 176 Ariz. at 185, 859 P.2d at 1318. In contrast, this respondent has never changed his story, has offered explanations for apparent inconsistencies in the evidence,5 and has not admitted any wrongdoing.
We expect and demand candor in disciplinary proceedings, particularly because attorneys are officers of this court. See id. at 187-88, 859 P.2d at 1320-21. Lying during such proceedings is one of the most serious ethical violations an attorney can commit and, absent mitigating circumstances, warrants the ultimate sanction of disbarment. See Fresquez, 162 Ariz. at 335, 783 P.2d at 781. However, despite (or perhaps because of) its seriousness, we cannot permit such an offense to be established on a lesser showing of proof than other ethical violations.
Respondent’s explanations are difficult to accept. After a careful review of the record, *455however, we cannot reach the conclusion that they are total fabrications. In other words, although we are concerned that respondent may have lied to the committee, we are not convinced that he did. Furthermore, we do not wish to deter attorneys from truthfully challenging charges against them for fear that they will not be believed and will then be disbarred for lying. See In re Shannon, 179 Ariz. 52, 81-82, 876 P.2d 548, 577-78 (1994) (Zlaket, J., dissenting).
Our decision today is consistent with an opinion issued just last year by a panel of this court that included the present dissenter. In that matter, the committee found the lawyer’s multiple explanations not credible “in light of later developments in the case and the testimony elicited during the proceedings.” In re Giles, 178 Ariz. 146, 150, 871 P.2d 693, 697 (1994). The court determined that the foregoing conclusion was “clearly supported by the record,” treated it as an aggravating circumstance, and suspended the attorney for 90 days. Id. at 150, 151, 871 P.2d at 697, 698. The difference is that the hearing committee in this case chose not to stop after its statement that respondent was not credible, but instead added, with no additional evidence or explanation, an assertion that he wilfully lied. We find no support in the record for this distinction.
III. Disposition
The committee determined that the underlying breach of professional responsibility was relatively minor under the circumstances, especially because the clients would probably have declined the offer had it been conveyed to them.6 Thus, it held that this violation alone would not warrant disbarment. The committee found, however, that respondent’s misrepresentations were much more serious. It also considered the following aggravating circumstances: 1) dishonest or selfish motive, 2) submission of false statements during the disciplinary process,7 and 3) respondent’s substantial experience in the practice of law.8 The committee did not consider respondent’s disciplinary record as an aggravating factor because his prior offense occurred nearly ten years earlier; however, it found no mitigating circumstances. Pursuant to Standard 6.11 of the American Bar Association’s Standards for Imposing Lawyer Sanctions (1991), the committee recommended disbarment. The commission adopted this recommendation.
We do not believe that the allegations of intentional misrepresentation have been proved by clear and convincing evidence. However, in determining an appropriate sanction for the underlying ethical breach, we cannot ignore the committee’s unanimous finding that respondent’s explanations were not credible. See Giles, 178 Ariz. at 150, 871 P.2d at 697. Taking this into account, together with the lack of any mitigating evidence and the strong recommendation of disbarment, we deem it appropriate to suspend respondent from the practice of law. The record reflects he has been on interim sus*456pension since March 21, 1994. We hereby suspend him for an additional two years commencing with the date of this opinion. Pursuant to Rule 52(a)(8), Ariz.R.Sup.Ct., respondent is also assessed costs incurred by the bar in the amount of $8,629.62.
FELDMAN, C.J., MOELLER, V.C.J., and MARTONE, J., concur.. The letter observed that respondent's clients had been “unwilling to entertain the settlement offer made by [the opposing parties] at the beginning of the appellate process.”
. Mrs. R apparently believed that respondent dismissed certain parties from the action as part of this conspiracy. She also thought that respondent failed to raise certain arguments at trial because, for some unexplained reason, he wanted the $86,500 judgment to be overturned on appeal.
. The dissent exhibits some discomfort with our use of the term "perjury.” Regardless of what he chooses to call it, however, Justice Corcoran clearly concludes that two people, respondent and his secretary, deliberately lied under oath. See A.R.S. § 13-2702: He also apparently suspects that criminal charges might be appropriate, as evidenced by his suggestion that the Attorney General or a county attorney should look into this matter.
. The dissent, without any support in the record, attributes to poor memory the fact that respondent made no effort to purge his file of incriminating correspondence before it was turned over to the clients. Interestingly, however, the dissent scoffs at the possibility that respondent’s testimony could have been the product of anything other than deliberate fabrication.
. The dissent specifically notes the absence of telephone records. The transcript of proceedings reflects, however, that the state bar, on whom the burden of clear and convincing proof rested, deliberately made no attempt to obtain and produce such documents. Respondent, on the other hand, apparently made two such attempts; the first, prior to the hearing and without benefit of a subpoena, was rejected by the telephone company because of the age of the records requested. At a subsequent hearing on his motion to reopen the proceedings, both respondent and the committee expressed an interest in examining the phone records, if possible. The committee thereafter issued subpoenas so that respondent could obtain whatever records were available. We have been furnished with what appears to be a portion of those documents, but it is clear that they are by no means complete, or even all that were subpoenaed. Furthermore, the record before us contains absolutely no analysis or testimony regarding these materials, and it is impossible to make any sense of them in their present form.
. The dissent suggests that the offer might have led to discussions and eventually to a settlement acceptable to Mr. and Mrs. R. This statement is unsupported by anything in the record and is pure speculation.
. Because even under our criminal jurisprudence (except in death penalty cases), aggravating circumstances need only be "supported by reasonable evidence,” State v. Turner, 141 Ariz. 470, 475, 687 P.2d 1225, 1230 (1984) (citing State v. Meador, 132 Ariz. 343, 347, 645 P.2d 1257, 1261 (Ct.App.1982)), it is difficult to believe that a higher standard of proof could or should be required in attorney discipline cases. We therefore find no inconsistency in this aggravating circumstance being considered despite our conclusion that the bar did not prove by clear and convincing evidence that respondent deliberately lied.
. Respondent does not challenge this aggravating circumstance, so we will not address it in any detail. We simply note that the court has previously indicated some difficulty with the use of this factor in aggravation. See In re Owens, 182 Ariz. 121, 126-127, 893 P.2d 1284, 1289-90 (April 13, 1995) (finding substantial experience in the practice of law, without prior discipline, to be a mitigating circumstance); In re Arrick, 180 Ariz. 136, 143, 882 P.2d 943, 950 (1994) (noting that the use of this factor in aggravation may deserve closer examination); Shannon, 179 Ariz. at 82, 876 P.2d at 578 (Zlaket, J., dissenting).