Cool adverbs are provided in this article. The words listed here are commonly found along with the verb cool in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb COOL.
completely, gradually
hardly, quickly
rapidly, really
slightly, slowly
sufficiently
Hope this word list had the cool adverb you were looking for. In addition to adverbs used with cool, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.