discordant

From Late Middle English discordaunt (“(adjective) not in accord or harmony; dissonant; (noun) element not in accord or harmony”), from Anglo-Norman descorda(u)nt, discorda(u)nt, Middle French descordant, discordant, and Old French descordant, discordant (“of people: quarrelsome; of things: in disagreement, at variance”) (modern French discordant), an adjective use of the present participle of descorder, discorder (“to fail to agree or harmonize, clash, disagree, discord”), from Latin discordāre, the present active infinitive of discordō (“to disagree, quarrel with”), from discors (“discordant, different, inharmonious”) + -ō (suffix forming regular first-conjugation verbs). Discors is derived from dis- (“prefix meaning ‘apart, in two’”) + cor (“heart; (figurative) mind; soul”) (ultimately from Proto-Indo-European *ḱḗr (“heart”)). By surface analysis, discord (noun) +‎ -ant (suffix forming adjectives from nouns with the sense ‘exhibiting [the condition or process described by the noun]’).