Boring adverbs are provided in this article. The words listed here are commonly found along with the verb boring in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb BORING.
extremely, fairly
incredibly, really
simply, terribly
totally, utterly
Hope this word list had the boring adverb you were looking for. In addition to adverbs used with boring, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.