Vexed adverbs are provided in this article. The words listed here are commonly found along with the verb vexed in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb VEXED.
deeply, exceedingly
extremely, greatly
grievously, particularly
really, sadly
sorely, thoroughly
Hope this word list had the vexed adverb you were looking for. In addition to adverbs used with vexed, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.