The Collaborative International Dictionary of English v.0.48:

Unfair \Un*fair"\, v. t. [1st pref. un- + fair.]
   To deprive of fairness or beauty. [R.] --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Unfair \Un*fair"\, a. [AS. unf[ae]ger unlovely. See Un- not,
   and Fair, a.]
   Not fair; not honest; not impartial; disingenuous; using or
   involving trick or artifice; dishonest; unjust; unequal.
   [1913 Webster]

         You come, like an unfair merchant, to charge me with
         being in your debt.                      --Swift.
   [1913 Webster] -- Un*fair"ly, adv. -- Un*fair"ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

unfair
    adj 1: not fair; marked by injustice or partiality or deception;
           "used unfair methods"; "it was an unfair trial"; "took an
           unfair advantage" [syn: unfair, unjust] [ant: fair,
           just]