sedative

[1]	narcotic , sedative drug , depressant , tranquillizer , opiate , downer , sleeping-pill , soporific , calmative , anodyne , depressant , hypnotic , barbiturate , lenitive , (Colloq) downer , knock-out drop , (Slang) Mickey (Finn)

adj.

[1]	narcotic , ataractic , ataraxic , tranquillizing , relaxing , tranquilizing , tranquillizing , soothing , calming , tranquilising , tranquillising , allaying , opiate , soporific , sleep-inducing , calmative , anodyne , lenitive , depressing , hypnotic