We found one dictionary that defines the word soniferously:

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1. soniferously: Wiktionary

Definitions from Wiktionary (soniferously) ▸ adverb:  In a soniferous manner. ▸ Words similar to soniferously ▸ Usage examples for soniferously ▸ Idioms related to soniferously ▸ Wikipedia articles (New!) ▸ Words that often appear near soniferously ▸ Rhymes of soniferously ▸ Invented words related to soniferously