nonchalant Definition

insouciant, unconcerned, casual, cavalier, calm, negligent, lackadaisical, flippant, unruffled, stoic, deadpan, indifferent, sheepish, jovial, easygoing, dismissive, impassive, cocky, smug, disdainful, unflappable, oblivious, diffident, imperturbable, carefree, brusque, sarcastic, amiable, businesslike, contemptuous, unperturbed, emotionless, lighthearted, polite, taciturn, haughty, cheerful, affable, guileless, pensive, phlegmatic, blase, bemused, bashful, stoical, apologetic, comical, incredulous, blithe, clueless, circumspect, unflustered, laconic, cocksure, gleeful, jocular, laidback, ambivalent, goofy, perturbed, apprehensive, unforthcoming, relaxed, unselfconscious, droll, unfazed, graceless, unworried, morose, genial, unassertive, chatty, chirpy, befuddled, talkative, hangdog, unenthusiastic, cheeky, nerdish, condescending, boastful, peevish, timid, glum, sanguine, demonstrative, schoolmarmish, coy, jittery, humorless, giggly, defiant, sly, imperious, uptight, impish, fatalistic, evasive, perplexed, playful,