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