A person who studies or specializes in antipathies, or someone who advocates against the expression of natural aversions.
From anti- (against) + patharian (one dealing with pathos or feeling), itself from Greek pathos meaning suffering or emotion. The term emerged in 19th-century philosophical discourse to describe those who theorized about natural dislikes and aversions.
This word captures an interesting paradox in philosophy: someone studying feelings of hatred and aversion systematically. Medieval scholars used similar constructions to describe those who analyzed the 'passions' academically, treating emotions as intellectual subjects rather than just things you experience.
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