'acrimoniousness' originates from the Latin word 'acrimonia,' where 'acer' meant 'sharp' or 'bitter.'

'acrimonia' transformed into the English word 'acrimonious' and eventually became 'acrimoniousness' to denote the quality of being acrimonious.

Initially, it meant 'sharpness or bitterness,' and this meaning has largely remained the same in modern usage.