Argus-eyed, Olympian, all ears, all eyes, aloof, apprehensive, armed, arrested, aux aguets, backward, bashful, blank, bridled, buried, cagey, calculating, canny, careful, cautious, chary, chilled, chilly, circumspect, cloaked, cold, concealed, considerate, constrained, controlled, cool, copyrighted, covered, covert, curbed, custodial, defended, deliberate, detached, discreet, disinclined to believe, disposed to doubt, distant, eagle-eyed, expressionless, forbidding, frigid, frosty, gingerly, hard of belief, hawk-eyed, heedful, hesitant, hidden, icy, impassive, impersonal, impervious to persuasion, in check, in leading strings, in remission, inaccessible, inconvincible, incredulous, inhibited, introverted, invulnerable, judicious, keen-eyed, leaving out nothing, leery, lidless, loath, mindful, modest, noncommittal, obscured, observant, offish, on guard, on leash, on the lookout, on the watch, open-eyed, overlooking no possibility, patented, pawky, pent-up, policed, politic, privy, protected, prudent, regardful, reluctant, remote, removed, repressed, reserved, restrained, retarded, reticent, retiring, safe, safeguarded, screened, sharp-eyed, sheltered, shielded, shrinking, shrouded, shy of belief, skeptical, sleepless, slow to act, slowed down, standoff, standoffish, subdued, suppressed, suspecting, suspicious, tentative, thorough, unadventurous, unaffable, unapproachable, uncommunicative, uncongenial, unconvincible, uncredulous, undaring, undemonstrative, under control, under discipline, under restraint, unenterprising, unexpansive, ungenial, unpersuadable, unpersuasible, unprecipitate, unwilling to accept, vigilant, wary, watchful, with open eyes, withdrawn