The definition of acrimonious is when someone or something is bitter or harsh in manner or speech, or rubs a person the wrong way.
When a person says mean and hurtful things to someone, it is an example of acting in an acrimonious manner.
bitter and caustic in temper, manner, or speech
Origin of acrimoniousMedieval Latin acrimoniosus: see acrimony
Bitter and sharp in language or tone; rancorous: an acrimonious debate between the two candidates.
(comparative more acrimonious, superlative most acrimonious)