acrimonious
Very angry and bitter, with people saying hurtful things.
When a disagreement turns acrimonious, it becomes bitter, angry, and filled with harsh feelings. The word describes arguments where people have moved beyond disagreement to saying cutting, mean-spirited things to hurt each other.
Imagine two friends arguing about which game to play. A normal disagreement might involve raised voices and frustration. An acrimonious argument involves insults, bringing up old grudges, and saying things specifically designed to wound. When a divorce becomes acrimonious, the parents might fight bitterly over every detail, making an already difficult situation much worse for everyone involved.
That bitterness captures exactly what acrimonious conflicts feel like: sharp words, bitter feelings, and a toxic atmosphere where kindness has disappeared.
You might read about acrimonious debates in Congress, where politicians attack each other personally rather than just disagreeing about policy. An acrimonious relationship between neighbors might involve years of petty complaints and hostile glares. The word suggests that anger has poisoned what might once have been civil or even friendly, turning ordinary disagreement into something uglier and harder to repair.