Injure

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late Middle English: back-formation from injury.

wiktionary

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A back-formation from injury, from Anglo-Norman injurie, from Latin iniūria(“injustice; wrong; offense”), from in-(“not”) + iūs, iūris(“right, law”).

etymonline

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injure (v.)

mid-15c., "do an injustice to, dishonor," probably a back-formation from injury, or else from Old French injuriier "to damage; offend," from Latin iniuriari "do an injury," from iniuria. Injury itself also served as a verb meaning "to injure, hurt, harm" (late 15c.). Related: Injured; injuring.