【Antipathy】 and 【aversion】 are closer synonyms than their corresponding adjectives when they denote the state of mind created by what is antipathetic to one.

【Antipathy】 distinctly implies an emotional state, often a settled emotion, which prevents reconciliation or contact or which more often definitely implies hostility (see ENMITY).

【Aversion】 on the other hand suggests a predisposition or an unwillingness to meet, encounter, or entertain, which shows itself in avoidance or rejection rather than in hatred; thus, one has an 【antipathy】 to cats who is violently repelled by them and drives them from his presence; one has an 【aversion】 to cats who merely avoids contact with them.