Expressing or characterized by a strong natural dislike or opposition between things or people.
From anti- (against) + pathetical (from Greek pathos, emotion/suffering, with -ical suffix). This adjective form emerged as philosophers needed precise language to describe opposing emotional or philosophical stances in academic writing.
The suffix -ical makes this feel more formal and technical than simply 'antipathetic,' which is why it appears most in academic and legal writing—it signals that opposition is being analyzed systematically rather than just felt.
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