Mordacious \Mor*da"cious\, a. [L. mordax, -acis, fr. mordere, morsum, to bite. See {Morsel}.] Biting; given to biting; hence, figuratively, sarcastic; severe; scathing. -- {Mor*da"cious*ly}, adv.
mordaciously adv : in a mordacious manner; "she taunted him mordaciously"