hostility

(noun) a hostile (very unfriendly) disposition. Synonyms: ill will. Example: "He could not conceal his hostility."

(noun) a state of deep-seated ill-will. Synonyms: enmity, antagonism.

(noun) the feeling of a hostile person. Synonyms: enmity, ill will. Example: "He could no longer contain his hostility."

(noun) violent action that is hostile and usually unprovoked. Synonyms: aggression.