After referring to the dictionary (which one fine professor schooled in critical thought once said was a terrible thing to do) I would tend to say partial, rather than biased.

bi·as    ( P )   Pronunciation Key  (bs)
n.

1. A line going diagonally across the grain of fabric: Cut the cloth on the bias.
2. 1. A preference or an inclination, especially one that inhibits impartial judgment.
   2. An unfair act or policy stemming from prejudice.
3. A statistical sampling or testing error caused by systematically favoring some outcomes over others.
4. Sports.
   1. A weight or irregularity in a ball that causes it to swerve, as in lawn bowling.
   2. The tendency of such a ball to swerve.
5. The fixed voltage applied to an electrode.

Slanting or diagonal; oblique: a bias fold.