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 ME animosite (< MF) < LL animōsitās.See animus, -ose1, -ity
[Middle English animosite, from Old French, from Late Latin animōsitās, courage, from Latin animōsus, bold, from animus, soul, spirit; see anə- in Indo-European roots.]