Flippant1. (a.) Disrespectfully casual in conversation; glib; superficial; as, a flippant remark.
2. (a.) Speaking fluently and confidently, without knowledge or consideration; empty; trifling; inconsiderate; pert; petulant.
3. (n.) A flippant person.
Thesaurus Entries
airy, bantering, belittling, biggety, bluff, booing, brash, brazen, careless, casual, catcalling, chaffing, cheeky, chutzpadik, cocky, contemptuous, crusty, cursory, degage, derisive, derisory, discourteous, dismissive, disregardant, disregardful, disrespectful, easygoing, facetious, facy, fleering, flip, fooling, forgetful, free and easy, fresh, frivolous, gally, gratuitous, grinning, heedless, hissing, hooting, impertinent, impudent, inconsiderate, indifferent, insolent, insouciant, irreverent, jeering, jocular, joshing, kidding, lazy, leering, light-hearted, malapert, mocking, nervy, oblivious, offhand, offhanded, panning, perfunctory, pert, quizzical, ragging, railing, rallying, razzing, reckless, regardless, respectless, ridiculing, roasting, rude, sassy, saucy, scoffing, scornful, shallow, smart, smart-alecky, smart-ass, smirking, sneering, snickering, sniggering, snorting, supercilious, superficial, tactless, taunting, teasing, thoughtless, twitting, uncalled-for, undiplomatic, unheedful, unheeding, unmindful, unprepared, unready, unserious, unsolicitous, untactful, unthinking, wise-ass