a feeling of strong dislike, ill will, or enmity that tends to display itself in action: a deep-seated animosity between two sisters; animosity against one's neighbor.
Origin: 1400–50;late Middle Englishanimosite (< Middle French) < Late Latinanimōsitās. See animus, -ose1, -ity
mid-15c., "vigor," from Fr. animosite, from L. animositatem (nom. animositas) "boldness, vehemence," from animosus "bold, spirited," from animus (see animus). Sense of "hostile feeling" is first recorded c.1600, from a secondary sense in Latin (see animus).