Found 2 items, similar to soporiferously.
English → English (WordNet) Definition: soporiferous soporiferous adj 1: sleep inducing [syn: soporific, somniferous, somnific, hypnogogic, hypnagogic] 2: inducing mental lethargy; “a narcotic speech” [syn: narcotic, soporific]
English → English (gcide) Definition: Soporiferously Soporiferous \Sop`o*rif"er*ous\, a. [L. soparifer; sopor a heavy sleep + ferere to bring.] Causing sleep; somniferous; soporific. “Soporiferous medicine.” --Swift. [1913 Webster] -- Sop`o*rif"er*ous*ly, adv. -- Sop`o*rif"er*ous*ness, n. [1913 Webster]