aloof • autistic • backward • bashful • blank • chill • chilled • chilly • cold • cold-blooded • constrained • cool • detached • disaccordant • discreet • dispassionate • distant • dull • emotionless • exclusive • expressionless • forbidding • frigid • frosty • guarded • heartless • icy • impassive • impersonal • inaccessible • incompatible • indifferent • inhospitable • inimical • insociable • introverted • modest • objective • obtuse • offish • Olympian • remote • removed • repressed • reserved • restrained • reticent • retiring • seclusive • self-absorbed • shrinking • spiritless • standoff • standoffish • strained • subdued • suppressed • tense • unaffable • unaffectionate • unamiable • unamicable • unapproachable • uncommunicative • uncompanionable • uncongenial • uncordial • undemonstrative • unemotional • unexpansive • unfriendly • ungenial • unharmonious • unimpassioned • unloving • unresponsive • unsociable • unsympathetic • untouchable • withdrawn