Outweigh adverbs are provided in this article. The words listed here are commonly found along with the verb outweigh in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb OUTWEIGH.
clearly, easily
generally, greatly
probably, significantly
substantially, usually
vastly
Hope this word list had the outweigh adverb you were looking for. In addition to adverbs used with outweigh, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.