casualness

lack of interest or concern her casualness distressed everyone who took the issue seriously Synonyms apathy, indifference, complacence, disinterestedness, disregard, incuriosity, incuriousness, insouciance, nonchalance, torpor, unconcernRelated Words halfheartedness, lukewarmness, tepidity, tepidness; carelessness, heedlessness, recklessness, unawareness; lethargy, listlessness; aloofness, coldness, cool, detachment, dispassion; callosity, callousness, hard-heartedness, hardness, insensitivity; bloodlessness, impassiveness, impassivity, phlegm, stoicism, stolidityNear Antonyms attention, attentiveness, awareness, conscientiousness, curiosity, heedfulness, keenness; sensitivity, warmheartedness; bias, partiality, prejudice; ardor, desire, fervency, passion, vehemence, warmth, zealAntonyms concern, interest, regard