Source : Webster's Revised Unabridged Dictionary (1913)

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

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.

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

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.

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

Source : WordNet®

unfair
     adj 1: showing favoritism [syn: {partial}] [ant: {impartial}]
     2: not fair; marked by injustice or partiality or deception;
        "used unfair methods"; "it was an unfair trial"; "took an
        unfair advantage" [syn: {unjust}] [ant: {fair}]