Collocations for biased - adj.

be

extremely, very
heavily, hopelessly, strongly
a little, slightly, etc.
naturally
inherently
ideologically, politically
racially

against
Fate was strongly biased against him.

in favour/favor of
The methods they employed were heavily biased in favour/favor of the rich.

towards/toward
Managers are naturally biased towards/toward projects showing a quick return.

Biased is used with these nouns:
coverage