Discreet1. (a.) Free from pretension; showing discernment; using judicious words that respect privacy; as, a discreet letter, especially in avoiding error or evil, and in the adaptation of means to ends; prudent; sagacious; judicious; not rash or heedless; cautious.
2. (a.) Differing; distinct.
Thesaurus Entries
Olympian, aloof, backward, bashful, blank, calculating, canny, careful, cautious, chary, chilled, chilly, circumspect, close, closemouthed, cold, considerate, constrained, controlled, cool, dark, deliberate, detached, diplomatic, discriminating, discriminative, distant, dry, enlightened, evasive, expressionless, forbidding, frigid, frosty, gingerly, guarded, heedful, hesitant, icy, impassive, impersonal, inaccessible, introverted, judgmatic, judicial, judicious, leaving out nothing, mindful, moderate, modest, noncommittal, offish, on guard, overlooking no possibility, pawky, politic, provident, prudent, prudential, reasonable, reflecting, reflective, regardful, remote, removed, repressed, reserved, restrained, reticent, retiring, safe, secret, secretive, shifty, shrinking, simple, slow to act, standoff, standoffish, subdued, suppressed, tactful, temperate, tentative, thorough, thoughtful, unadorned, unadventurous, unaffable, unapproachable, uncommunicative, uncongenial, undaring, undemonstrative, unelaborate, unenterprising, unexcessive, unexpansive, unextreme, ungenial, unostentatious, unprecipitate, unpretentious, wary, watchful, well-advised, well-judged, withdrawn