Loosened adverbs are provided in this article. The words listed here are commonly found along with the verb loosened in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb LOOSENED.
carefully, easily
finally, gently
gradually, quickly
slightly, slowly
suddenly
Hope this word list had the loosened adverb you were looking for. In addition to adverbs used with loosened, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.