Synonyms and related words :
Lethean, Olympian, absentminded, aloof, amnestic, backward, bashful, blank, blocked, chilled, chilly, cold, constrained, converted, cool, crushed, detached, discreet, distant, expressionless, forbidding, forgetful, forgetting, frigid, frosty, guarded, heedless, icy, impassive, impersonal, inaccessible, inclined to forget, introverted, modest, oblivious, offish, quashed, quelled, remote, removed, reserved, restrained, reticent, retiring, shrinking, smashed, smothered, squashed, squelched, standoff, standoffish, stifled, subdued, suffocated, suppressed, unaffable, unapproachable, uncongenial, undemonstrative, unexpansive, ungenial, unmindful, withdrawn