Expressing adverbs are provided in this article. The words listed here are commonly found along with the verb expressing in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb EXPRESSING.
accurately, actually, adequately, clearly, constantly
continually, directly, exactly, freely, frequently
fully, loudly, merely, openly, plainly
probably, publicly, really, simply, simultaneously
stably, strongly, truly, verbally, warmly
Hope this word list had the expressing adverb you were looking for. In addition to adverbs used with expressing, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.