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.
it was an unfair trial
took an unfair advantage
used unfair methods
unexplained
unexplored
unexpurgated
unfading
unfailing
unfair
unfairness
unfaithful
unfaltering
unfamiliar
unfamous