Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class VI. Words Relating to the Sentient and Moral Powers
Section IV. Moral Affections
3. Moral Conditions

939. Probity.

   NOUN:PROBITY, integrity, rectitude; uprightness &c. adj.; honesty, faith; honor; bonne foi [F.], good faith, bona fides [L.]; purity, grace; clean hands.
  constancy; faithfulness &c. adj.; fidelity, loyalty, incorruption [archaic], incorruptibility; trustworthiness &c. adj.; truth, candor, singleness of heart; veracity [See Veracity]; tender conscience &c. (sense of duty) [See Duty].
  fairness &c. adj.; fair play, justice, equity, impartiality, principle.
  court of honor, a fair field and no favor; argumentum ad verecundiam [L.].
  PUNCTILIOUSNESS, punctilio, delicacy, nicety, scrupulosity, scrupulousness &c. adj.; scruple; point, – of honor; punctuality [rare in this sense].
  dignity (repute) [See Repute]; respectability, respectableness &c. adj.;
  MAN OF HONOR, man of his word, gentleman, gentilhomme [F.], fidus Achates [L.], preux chevalier [F.], galantuomo [It.]; true-penny, trump [slang], brick [slang or colloq.], true Briton; white man [slang, U. S.].
   VERB:BE HONORABLE &c. adj.; deal -honorably, – squarely, – impartially, – fairly; speak the truth (veracity) [See Veracity]; draw a straight furrow; tell the truth and shame the Devil, vitam impendere vero [L.]; show a proper spirit, make a point of; do one’s duty (virtue) [See Virtue]; play the game [colloq.].
  redeem one’s pledge [See Duty]; keep -, be as good as- one’s -promise, – word; keep faith with, not fail.
  give and take, audire alteram partem [L.], give the Devil his due, put the saddle on the right horse.
  redound to one’s honor.
   ADJECTIVE:UPRIGHT; honest, – as daylight; veracious [See Veracity]; virtuous [See Virtue]; noble, honorable, reputable, respectable; fair, right, just, equitable, impartial, evenhanded, square; fair -, open- and aboveboard; white [slang, U. S.].
  inviolable, inviolate, unviolated, unbroken, unbetrayed; unbought, unbribed.
  constant, – as the northern star; faithful, loyal, staunch; true, – blue, – to one’s colors, – to the core, – as the needle to the pole; “marble-constant” [Antony and Cleopatra]; true-hearted, trusty, trustworthy; as good as one’s word, to be depended on, incorruptible, honest as the day.
  manly, straightforward (ingenuous) [See Artlessness]; frank, candid, open-hearted.
  CONSCIENTIOUS, tender-conscienced, right-minded, high-principled, highminded, scrupulous, religious, strict; nice, punctilious, overscrupulous, correct, punctual.
  STAINLESS, unstained, untarnished, unsullied, untainted, unperjured, uncorrupt, uncorrupted; innocent [See Innocence]; pure, undefiled, undepraved, undebauched; integer vitæ scelerisque purus [Horace]; justus et tenax propositi [Horace]; supramundane, unworldly.
  chivalrous, jealous of honor, sans peur et sans reproche [F.]; high-spirited.
   ADVERB:HONORABLY &c. adj.; bonâ fide [L.]; on the square [colloq.], in good faith, in all honor, by fair means, foro conscientiæ [L.], with clean hands.
   INTERJECTION:on my honor! honor bright! [colloq.]; by my faith!    QUOTATIONS:
  1. A face untaught to feign.—Pope
  2. Bene qui latuit bene vixit.—Ovid
  3. Mens sibi conscia recti; probitas laudatur et alget.—Juvenal
  4. Fidelis ad urnam.
  5. His heart as far from fraud as heaven from earth.—Two Gentlemen
  6. Loyauté m’oblige; loyauté n’a honte.
  7. What stronger breastplate than a heart untainted?—Henry VI
  8. Among the faithless, faithful only he.—Milton