Disagree

google

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late 15th century (in disagree (sense 2), also in the sense ‘refuse to agree to’): from Old French desagreer .

wiktionary

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From Middle English disagre(“to refuse to assent to”), [1] from Anglo-Norman disagreer, disagrer, desagreer(“to refuse assent”), from Old French desagreer, desagrëer(“to be disagreeable; to be unpleasant”) (modern French désagréer(“to displease”)); [2] the English word is analysable as dis- +‎ agree.

etymonline

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disagree (v.)

late 15c., "refuse assent to," from Old French desagreer (12c.), from des- "not, opposite of" (see dis-) + agreer "to please, satisfy; to receive with favor, take pleasure in" (see agree). Sense of "differ in opinion, express contrary views" is from 1550s. Related: Disagreed; disagreeing.