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

Lucinda, a Stockholm café owner, faced an acrimonious feud with her neighbor over a misplaced fire extinguisher. "It was here first!" they shouted at each other, as if the red cylinder had feelings to hold grudges. Lucinda couldn't help but chuckle; even a disagreement deserved a dash of humor.

At the Quiapo Market in Manila, Nadia's eyes narrowed as her neighbor opened his stall next to hers, invading her space. 'There goes my business,' she muttered, snapping a wilted banana leaf in half with an acrimonious glare.

“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.”