Plural of animosity; instances or feelings of strong hostility, ill will, or bitter resentment between people or groups.
From Latin 'animositas' meaning hostility or vigor, derived from 'animosus' (spirited). The meaning evolved to emphasize the hostile aspect over the merely spirited one.
Animosity originally just meant 'having spirit'—but once we needed a word for long-standing hatred, animosity got kidnapped from its original meaning and never returned to describing courage!
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