Home » Blog » Word of the moment Acrimonious What does acrimonious mean? AnswerAcrimonious (adjective): caustic, stinging, or bitter in nature, speech, behavior, etc. an acrimonious answer; an acrimonious dispute.Acrimonious (adjective): caustic, stinging, or bitter in nature, speech, behavior, etc. an acrimonious answer; an acrimonious dispute. Share this