insouciance

lack of interest or concern wandered into the meeting with complete insouciance to the fact that she was late Synonyms apathy, casualness, complacence, disinterestedness, disregard, incuriosity, incuriousness, indifference, 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