mordacious

adjective4

1. •
   Biting, causing a physical bite or sting; corrosive
2. •
   Sharp or caustic in style or tone.
3. •
   Sharp in intent, sarcastic.

   • And that is really the long and the short of the whole matter, my mordacious friend. — 1927
4. •
   Prone to biting, aggressive (of an animal etc.).