M0419700 (môr-dā′shəs)adj.1. Given to biting; biting.2. Caustic; sarcastic.[Latin mordāx, mordāc- (from mordēre, to bite; see mer- in Indo-European roots) + -ious.]mor·da′cious·ly adv.mor·dac′i·ty(-dăs′ĭ-tē) n.Thesaurus
Adv.
1.mordaciously - in a mordacious manner; "she taunted him mordaciously"