Improving adverbs are provided in this article. The words listed here are commonly found along with the verb improving in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb IMPROVING.
actually, certainly, constantly, continually, continuously
daily, definitely, dramatically, generally, gradually
greatly, materially, morally, permanently, possibly
potentially, progressively, rapidly, really, significantly
simply, simultaneously, slightly, slowly, steadily
substantially, ultimately, vastly
Hope this word list had the improving adverb you were looking for. In addition to adverbs used with improving, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.