Inflected forms: pl. an·i·mos·i·ties 1. Bitter hostility or open enmity; active hatred. 2. A hostile feeling or act. See synonyms at enmity.
ETYMOLOGY:
Middle English animosite, from Old French, from Late Latin animsits, courage, from Latin animsus, bold, from animus, soul, spirit. See an- in Appendix I.