Olympian, Abashed, Aloof, Autistic, Awkward, Backward, Blank, Boggling, Chilled, Chilly, Close, Cold, Confused, Conscious, Constrained, Cool, Cowardly, Coy, Demure, Demurring, Detached, Diffident, Discreet, Distant, Embarrassed, Expressionless, Faltering, Fearful, Fearing, Fearsome, Forbidding, Frigid, Frosty, Guarded, Hesitant, Hesitating, Icy, Impassive, Impersonal, Inaccessible, Inarticulate, Incompatible, Introverted, Jumpy, Meek, Modest, Morose, Mousy, Nervous, Recoiling, Remote, Removed, Repressed, Reserved, Restrained, Reticent, Retiring, Scary, Scrupulous, Shaky, Shamefaced, Sheepish, Shivery, Shrinking, Shy, Skittish, Snug, Squeamish, Stammering, Subdued, Sullen, Suppressed, Timid, Trembling, Tremulous, Unapproachable, Unassertive, Unassuming, Uncomfortable, Uncommunicative, Uncongenial, Undemonstrative, Uneasy, Unfriendly, Unsociable, Unsocial, Withdrawn