Synonyms and related words :
airy, apathetic, ataractic, blase, boorish, caddish, careless, casual, coarse, crude, cursory, degage, devil-may-care, disinterested, dispassionate, disregardant, disregardful, easygoing, flippant, forgetful, free and easy, heedless, ill-bred, inattentive, inconsiderate, incurious, indifferent, inexcitable, insensitive, insouciant, lackadaisical, lazy, listless, loutish, louty, mindless, nasty, negligent, nonchalant, oblivious, offensive, offhand, perfunctory, pococurante, reckless, regardless, respectless, tactless, thoughtless, turned-off, unanxious, unconcerned, undiplomatic, undiscriminating, unfeminine, ungenteel, ungentle, ungentlemanly, unheedful, unheeding, uninterested, unladylike, unmindful, unprepared, unready, unrefined, untactful, unthinking, vulgar