- soporific, soporiferous, somniferous, somnific, hypnogogic, hypnagogic - sleep inducing
Antonym: stimulative (indirect, via depressant)
- narcotic, soporiferous, soporific - inducing mental lethargy; "a narcotic speech"
Antonym: interesting (indirect, via uninteresting)
- soporific, hypnotic - a drug that induces sleep
--1 is a kind of drug; hypnagogue
--1 has particulars:narcoleptic; sleeping pill, sleeping tablet, sleeping capsule, sleeping draught