aloof • apathetic • autistic • backward • bashful • blah • blank • blase • careless • chilled • chilly • cold • constrained • cool • detached • discreet • disinterested • dispassionate • distant • dull • emotionless • exclusive • expressionless • forbidding • frigid • frosty • guarded • heartless • heedless • icy • impassive • impersonal • inaccessible • indifferent • inexcitable • insouciant • introverted • Laodicean • lethargic • listless • modest • nonchalant • numb • numbed • offish • Olympian • passive • phlegmatic • remote • removed • repressed • reserved • restrained • reticent • retiring • seclusive • shrinking • sluggish • spiritless • standoff • standoffish • Stoic • stolid • subdued • supine • suppressed • unaffable • unapproachable • uncaring • unconcerned • uncongenial • undemonstrative • unemotional • unexpansive • unfriendly • ungenial • uninterested • unmindful • unresponsive • withdrawn