Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
bias(s)ed [ˈbaɪəst] adj (jury) пристра́стный*пристра́стен (judgement) предвзя́тый/предвзя́т
he is/was bias(s)ed against он предубеждён/был предубеждён про́тив +gen
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: