Swim adverbs are provided in this article. The words listed here are commonly found along with the verb swim in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb SWIM.
actually, barely
directly, easily
freely, generally
rapidly, really
slowly
Hope this word list had the swim adverb you were looking for. In addition to adverbs used with swim, other example verb adverb pairings can be found on this site.
Sometime ,rarely ,often,