Biased adverbs are provided in this article. The words listed here are commonly found along with the verb biased in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb BIASED.
clearly, culturally, extremely, heavily
highly, ideologically, inherently, naturally
negatively, obviously, politically, positively
possibly, potentially, probably, racially
seriously, slightly, strongly, systematically
unduly, usually
Hope this word list had the biased adverb you were looking for. In addition to adverbs used with biased, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.