Etymology
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acrimonious (adj.)

1610s, "acrid," from French acrimonieux, from Medieval Latin acrimoniosus, from Latin acrimonia "sharpness" (see acrimony). Now usually figurative, of dispositions, debates, etc., "bitter, irritating in manner" (1775). Related: Acrimoniously; acrimoniousness.

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Definitions of acrimonious

acrimonious (adj.)
marked by strong resentment or cynicism;
an acrimonious dispute
Synonyms: bitter
From wordnet.princeton.edu