From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
mordacious /mɔːdˈeɪʃəs/
[rare] [fig.] beißend, bissig, ätzend, scharf, giftig, gallig [selten] , kaustisch <adj> [geh.] [selten] [übtr.]
Note: Äußerung
Synonyms: biting, cutting, mordant, pungent, stinging, sharp, acid, acidulous, tart, caustic, snarky, trenchant
see: mordant ridicule
Note: statement