Synonyms of stupefacient

2 Syllables
calming, numbing
3 Syllables
somnolent, hypnotic, narcotic, nepenthe, deadening, somnific, opiate, laudanum, stupefying
4 Syllables
soporific, analgesic, anesthetic, somnifacient, somnorific, sedative
5 Syllables
soporiferous, stupefactive