Synonyms and related words :
airy, arbitrary, boorish, brash, caddish, capricious, careless, casual, coarse, crude, cursory, degage, disregardant, disregardful, easygoing, flippant, forgetful, free and easy, hasty, heedless, hotheaded, ill-advised, ill-bred, ill-considered, ill-contrived, ill-devised, ill-gauged, ill-judged, impolitic, imprudent, inadvertent, inadvisable, incautious, indifferent, indiscreet, inexpedient, injudicious, insensate, insensitive, insouciant, intolerant, irrational, lazy, loutish, louty, madcap, mindless, misadvised, misguided, myopic, nasty, oblivious, offensive, offhand, perfunctory, rash, reasonless, reckless, regardless, respectless, rude, senseless, sharp, shortsighted, tactless, thoughtless, unaccommodating, unadvised, uncalculating, uncaring, unceremonious, uncomplaisant, unconcerned, unconsidered, uncooperative, undiplomatic, undiscerning, unfeminine, unforeseeing, ungenteel, ungentle, ungentlemanly, ungracious, unguarded, unheedful, unheeding, unhelpful, unladylike, unmindful, unobliging, unprepared, unready, unreasonable, unreasoning, unrefined, unreflecting, unreflective, unseeing, unsensible, unsolicitous, unsound, unsympathetic, untactful, unthinking, unthoughtful, unwise, vulgar, witless