impersonal

clinical, dispassionate, professional

indrawn, introverted, nongregarious, recessive, reclusive, reserved, unsocial, withdrawn

detached, dispassionate, standoffish

aloof, antisocial, asocial, buttoned-up, cold, cold-eyed, cool, detached, distant, dry, frosty, offish, remote, standoff, standoffish, unbending, unclubbable, unsociable

automatic, canned, concocted, fabricated, hokey, labored, manufactured, pat, unauthentic, unreal, unrealistic

misanthropic

apathetic, hard, indifferent, unconcerned

reserved, soulless, undemonstrative, unemotional, unresponsive

disinterested, incurious, uninterested

reticent, silent, taciturn, uncommunicative, unenthusiastic

diffident, shy, timid

antiseptic, arctic, brittle, chill, chilly, clammy, cold-blooded, cold-eyed, coldish, frigid, frosty, frozen, gelid, glacial, hard-eyed, icy, uncordial, unfriendly, unsympathetic, wintry (also wintery)

bloodless, coldhearted, hard-hearted, heartless, kindless, pitiless, uncaring, unfeeling