Unfair

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Old English unfæger ‘not beautiful’ (see un-1, fair1).

wiktionary

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From Middle English unfair(“unattractive, unseemly”), from Old English unfæġer(“ugly”), equivalent to un- +‎ fair.

etymonline

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unfair (adj.)

Old English unfægr "unlovely, not beautiful, deformed, hideous, unlovable," from un- (1) "not" + fair (adj.). Similar formation in Old Norse ufagr, Gothic unfagrs. Meaning "wicked, evil, bad" is recorded from c. 1300. Sense of "not equitable, unjust" is first recorded 1713. Related: Unfairly.