Etymology
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animosity (n.)

early 15c., "vigor, bravery" (a sense now obsolete), from Old French animosité (14c.) or directly from Latin animositatem (nominative animositas) "boldness, vehemence," from animosus "bold, spirited," from animus "life, breath" (from PIE root *ane- "to breathe"). Sense of "active hostile feeling" is first recorded c. 1600, from a secondary sense in Latin.

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Definitions of animosity

animosity (n.)
a feeling of ill will arousing active hostility;
Synonyms: animus / bad blood
From wordnet.princeton.edu