mordacious
Biting, causing a physical bite or sting; corrosive
Sharp or caustic in style or tone.
Sharp in intent, sarcastic.
And that is really the long and the short of the whole matter, my mordacious friend.
Prone to biting, aggressive (of an animal etc.).
Not gyved with connubial relations, I entered upon my migration entirely isolated, with the exception of a canine quadruped whose mordacious, latrant, lusorious, and venatic qualities, are without parity.
Where it comes from
From Latin mordax (“given to biting, corrosive”) (from mordere (“to bite, sting”)) + -ious.
Adapted from the Wiktionary entry mordacious (CC BY-SA 4.0).