Sighing adverbs are provided in this article. The words listed here are commonly found along with the verb sighing in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb SIGHING.
contentedly, deeply
heavily, loudly
mournfully, sadly
softly
Hope this word list had the sighing adverb you were looking for. In addition to adverbs used with sighing, other example verb adverb pairings can be found on this site.
Rarely