What is a synonym for acrimony?

Here are some synonyms for acrimony, depending on the specific nuance you want to convey:

General:

* Bitterness

* Harshness

* Sharpness

* Asperity

* Rancor

* Acridness

* Venom

More intense:

* Spite

* Malice

* Hatred

* Hostility

More specific:

* For a relationship: Estranged, Antagonistic, Fractious

* For language: Caustic, Scathing, Cutting, Vitriolic

The best synonym will depend on the specific context in which you are using the word.