acrimonious

marked by strong resentment or cynicism

Acrid; corrosive; as, acrimonious gall.

Latin 'acrimonia' sour taste

“I always distrust the soundness of political councils that are accompanied by acrimonious and disparaging attacks upon any great class of our fellow-citizens.”

— Charles Dudley Warner, The Complete Project Gutenberg Writings of Charles Dudley Warner

“In an acrimonious dispute conducted in the media the matter was brought to the BSA shareholders at the Annual General Meeting where the decision of the Board was upheld.”