Repugnant

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late Middle English (in the sense ‘offering resistance’): from Old French repugnant or Latin repugnant- ‘opposing’, from the verb repugnare (see repugnance).

wiktionary

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From Middle English repugnaunt, from Old French repugnant, borrowed from Latin repugnans, present participle of repugnare(“to oppose, to fight against”), from re-(“back, against”) + pugnare(“to fight”); see pugnacious.

etymonline

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repugnant (adj.)

early 15c., repugnaunt, "hostile, opposed; contrary, inconsistent, contradictory," from Old French repugnant "contradictory, opposing" or directly from Latin repugnantem (nominative repugnans), present participle of repugnare "to resist, fight back, oppose; disagree, be incompatible," from re- "back, against, in opposition" (see re-) + pugnare "to fight" (from PIE root *peuk- "to prick").

The meaning "distasteful, objectionable" is from 1777; that of "offensive, loathsome, exciting aversion" is by 1879.