repugnant

From Middle English repugnaunt, from Old French repugnant, borrowed from Latin repugnans, the present participle of repugnare, 'to oppose, to fight against,' built from re- ('back, against') plus pugnare ('to fight').

The facts given show only the word's borrowing path from Latin through Old French into Middle English, with no further recorded shift in meaning.

It shares its pugn- root with pugnacious, both tracing back to Latin pugnare, 'to fight.'