Synonyms: These nouns refer to the feeling or expression of deep-seated ill will. Enmity is hatred such as might be felt for an enemy: the wartime enmity of the two nations.
Hostility implies the clear expression of enmity: "If we could read the secret history of our enemies, we should find . . . enough to disarm all hostility" (Henry Wadsworth Longfellow).
Antagonism is hostility that quickly results in active resistance, opposition, or contentiousness: "the early struggles of famous authors, the notorious antagonism of publishers and editors to any new writer of exceptional promise" (Edith Wharton).
Animosity often triggers bitter resentment or punitive action: overcame her animosity toward her parents.
Rancor suggests vengeful hatred and resentment: filled with rancor after losing his job.
Antipathy is deep-seated aversion or repugnance: an antipathy to social pretension.
Animus is distinctively personal, often based on one's prejudices or temperament: an inexplicable animus against intellectuals.