acrimonious

adjective2

1. •
   Angry, acid, and sharp in delivering argumentative replies: bitter, mean-spirited, sharp in language or tone.

   • That would be a way more acrimonious custody battle than the one my parents had over me. — 2010
2. •
   (no longer used) Harsh and sharp, or bitter and not pleasant to the taste; acrid, pungent.