soporific soporiferousness • soporifical · · · Info · Definitions · Synonyms · Characters · · soporific · · Text Latin · · Script 9 · · Length Definitions · · · (noun) a drug that induces sleep. Synonyms: hypnotic. · · Noun Definition 1 (adj) sleep inducing. Synonyms: soporiferous, somniferous, somnific, hypnogogic, hypnagogic. · · Adjective Definition 1 (adj) inducing mental lethargy. Synonyms: narcotic, soporiferous. Example: "A narcotic speech." · · Adjective Definition 2 Synonyms · · · hypnotic · · Synonym 1 soporiferous · · Synonym 2 somniferous · · Synonym 3 somnific · · Synonym 4 hypnogogic · · Synonym 5 hypnagogic · · Synonym 6 narcotic · · Synonym 7 Characters · · c latin small letter c U+0063 f latin small letter f U+0066 i latin small letter i U+0069 o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073