dispassionate, objectiveimpersonal, professionalbusinesslikeapathetic, hard, indifferent, unconcerneddisinterested, incurious, uninterestedmisanthropicaloof, antisocial, asocial, buttoned-up, cold, cold-eyed, cool, detached, distant, dry, frosty, offish, remote, standoff, standoffish, unbending, unclubbable, unsociableantiseptic, arctic, brittle, chill, chilly, clammy, cold-blooded, coldish, frigid, frozen, gelid, glacial, hard-eyed, icy, uncordial, unfriendly, unsympathetic, wintry(also wintery)reticent, silent, taciturn, uncommunicativereserved, soulless, undemonstrative, unemotional, unresponsivebloodless, coldhearted, hard-hearted, heartless, kindless, pitiless, uncaring, unfeelingearnest, grave, humorless, no-nonsense, po-faced(British), sedate, serious, severe, sober, sobersided, solemn, staid, uncomic, unsmiling, weightydignified, distinguished, elevated, serious-minded