Disdain

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Middle English: from Old French desdeign (noun), desdeignier (verb), based on Latin dedignari, from de- (expressing reversal) + dignari ‘consider worthy’ (from dignus ‘worthy’).

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From Middle English disdeynen, from Old French desdeignier (modern French dédaigner).

etymonline

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disdain (v.)

mid-14c., desdeinen, "think unworthy or worthless, look upon with contempt," from Old French desdeignier "disdain, scorn, refuse, repudiate" (Modern French dédaigner), from des- "do the opposite of" (see dis-) + deignier "treat as worthy," from Latin dignari "to deem worthy or fit," from dignus "worthy," from PIE root *dek- "to take, accept." Related: Disdained; disdaining.

disdain (n.)

mid-14c., desdeyn "scorn, a feeling of contempt mingled with aversion," earlier dedeyne (c. 1300), from Old French desdeigne(Modern French dédain), from desdeignier (see disdain (v.)). Sometimes in early Modern English shortened to sdain.