buttoned–up

having or showing a lack of friendliness or interest in others a buttoned-up colleague who had no interest in talking about anything but work, even at parties Synonyms aloof, antisocial, asocial, buttoned-up, cold, cold-eyed, detached, distant, dry, frosty, offish, remote, standoff, standoffish, unbending, unclubbable, unsociableRelated Words indrawn, introverted, nongregarious, recessive, reclusive, reserved, unsocial, withdrawn; misanthropic; apathetic, hard, indifferent, unconcerned; clinical, dispassionate, impersonal, professional; disinterested, incurious, uninterested; reticent, silent, taciturn, uncommunicative; diffident, shy, timid; cliquey, cliquish, clubbishNear Antonyms boon, clubbable (also clubable), clubby, companionable, convivial, extroverted (also extraverted), gregarious, outgoing; communicative, expansive, garrulous, talkative; affable, folksy, genial, gracious, hospitable; agreeable, amiable, congenial, kindly, neighborlyAntonyms cordial, friendly, sociable, social, warm