The Collaborative International Dictionary of English v.0.48:

Honest \Hon"est\, v. t. [L. honestare to clothe or adorn with
   honor: cf. F. honester. See Honest, a.]
   To adorn; to grace; to honor; to make becoming, appropriate,
   or honorable. [Obs.] --Abp. Sandys.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Honest \Hon"est\, a. [OE. honest, onest, OF. honeste, oneste, F.
   honn[^e]te, L. honestus, fr. honos, honor, honor. See
   Honor.]
   1. Decent; honorable; suitable; becoming. --Chaucer.
      [1913 Webster]

            Belong what honest clothes you send forth to
            bleaching!                            --Shak.
      [1913 Webster]

   2. Characterized by integrity or fairness and
      straightforwardness in conduct, thought, speech, etc.;
      upright; just; equitable; trustworthy; truthful; sincere;
      free from fraud, guile, or duplicity; not false; -- said
      of persons and acts, and of things to which a moral
      quality is imputed; as, an honest judge or merchant; an
      honest statement; an honest bargain; an honest business;
      an honest book; an honest confession.
      [1913 Webster]

            An honest man's the noblest work of God. --Pope.
      [1913 Webster]

            An honest physician leaves his patient when he can
            contribute no farther to his health.  --Sir W.
                                                  Temple.
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            Look ye out among you seven men of honest report.
                                                  --Acts vi. 3.
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            Provide things honest in the sight of all men.
                                                  --Rom. xii.
                                                  17.
      [1913 Webster]

   3. Open; frank; as, an honest countenance.
      [1913 Webster]

   4. Chaste; faithful; virtuous.
      [1913 Webster]

            Wives may be merry, and yet honest too. --Shak.

   Syn: Upright; ingenuous; honorable; trusty; faithful;
        equitable; fair; just; rightful; sincere; frank; candid;
        genuine.
        [1913 Webster]

WordNet (r) 3.0 (2006):

honest
    adj 1: not disposed to cheat or defraud; not deceptive or
           fraudulent; "honest lawyers"; "honest reporting" [syn:
           honest, honorable] [ant: dishonest, dishonorable]
    2: without dissimulation; frank; "my honest opinion"
    3: worthy of being depended on; "a dependable worker"; "an
       honest working stiff"; "a reliable sourcSFLe of information";
       "he was true to his word"; "I would be true for there are
       those who trust me" [syn: dependable, honest, reliable,
       true(p)]
    4: without pretensions; "worked at an honest trade"; "good
       honest food"
    5: marked by truth; "gave honest answers"; "honest reporting"
    6: not forged; "a good dollar bill" [syn: good, honest]
    7: gained or earned without cheating or stealing; "an honest
       wage"; "an fair penny" [syn: honest, fair]

Moby Thesaurus II by Grady Ward, 1.0:

162 Moby Thesaurus words for "honest":
   Christian, angelic, authentic, blameless, bona fide, candid,
   card-carrying, clean, conscientious, creditable, decent,
   dependable, dinkum, direct, dispassionate, equitable, erect,
   estimable, ethical, explicit, fair, following the letter,
   forthright, frank, full of integrity, genuine, godly, good,
   high-minded, high-principled, highly respectable, honest-to-God,
   honorable, immaculate, inartificial, incorruptible, ingenuous,
   inviolate, irreproachable, just, law-abiding, law-loving,
   law-revering, lawful, legitimate, lifelike, literal, manly, moral,
   native, natural, naturalistic, noble, objective, on the level,
   open, original, plain, plain-spoken, principled, proper, pure,
   real, realistic, reliable, reputable, respectable, right,
   right-minded, righteous, rightful, saintlike, saintly, scrupulous,
   seraphic, simon-pure, simple, sincere, sound, spotless, square,
   square-dealing, square-shooting, stainless, sterling, straight,
   straightforward, sure-enough, true, true to life, true to nature,
   true to reality, true-dealing, true-devoted, true-disposing,
   true-souled, true-spirited, truehearted, trustworthy, trusty,
   truthful, unadulterated, unaffected, unambiguous, unartificial,
   unassumed, unassuming, unblemished, uncolored, unconcocted,
   unconstrained, uncopied, uncorrupt, uncorrupted, uncounterfeited,
   undefiled, undesigning, undisguised, undisguising, undissembled,
   undistorted, unequivocal, unexaggerated, unfabricated, unfanciful,
   unfeigned, unfeigning, unfictitious, unflattering, unimagined,
   unimitated, unimpeachable, uninhibited, uninvented, unpretended,
   unpretending, unpretentious, unqualified, unreserved, unrestrained,
   unromantic, unsimulated, unspecious, unspotted, unstained,
   unsullied, unsynthetic, untarnished, unvarnished, upright,
   uprighteous, upstanding, valid, veracious, verbal, verbatim,
   veridical, verisimilar, virtuous, word-for-word, worthy,
   yeomanly