[syn: biased, colored, coloured, one-sided, slanted]
The Collaborative International Dictionary of English v.0.48:
One-sided \One`-sid"ed\, a.
   1. Having one side only, or one side prominent.
      [1913 Webster]
   2. Hence: Limited to one side; favoring one person or side
      over another; partial; unjust; unfair; as, a one-sided
      view or statement. [WordNet sense 5] "Unguarded and
      one-sided language." --T. Arnold.
   Syn: biased, colored, slanted.
        [1913 Webster]
   3. Having one team or party greatly superior; strongly
      favoring only one side; uneven; imbalanced; unequal; as, a
      one-sided contest; -- of contests, generally. [WordNet
      sense 4]
      [PJC]
   4. (Bot.) Growing on one side of a stem; as, one-sided
      flowers.
      [1913 Webster]
   5. Using only one side, or having only one side usable; as,
      one-sided printing; one-sided film; -- used mostly of
      sheets of material used for printing or imaging.
      [PJC]
   6. Performed by only one party or side; -- of actions
      directly affecting more than one party. Opposite of
      multilateral. [WordNet sense 2]
   Syn: unilateral (vs. bilateral).
        [WordNet 1.5 +PJC]
   7. out of proportion in shape.
   Syn: ill-proportioned, lopsided.
        [WordNet 1.5]
   8. Not reversible or capable of having either side out; -- of
      cloth fabrics or clothing. Opposite of reversible.
      [WordNet sense 1]
   Syn: nonreversible.
        [WordNet 1.5] -- One`-sid"ed*ly, adv. --
        One`-sid"ed*ness, n.
        [1913 Webster]
WordNet (r) 3.0 (2006):
one-sided
    adj 1: not reversible or capable of having either side out [syn:
           nonreversible, one-sided] [ant: reversible, two-
           sided]
    2: involving only one part or side; "unilateral paralysis"; "a
       unilateral decision" [syn: unilateral, one-sided] [ant:
       many-sided, multilateral]
    3: favoring one person or side over another; "a biased account
       of the trial"; "a decision that was partial to the defendant"
       [syn: biased, colored, coloured, one-sided,
       slanted]