Adjective sedative has 1 sense
  1. ataractic, ataraxic, sedative, tranquilizing, tranquilising - tending to soothe or tranquilize; "valium has a tranquilizing effect"; "took a hot drink with sedative properties before going to bed"
    Antonym: stimulative (indirect, via depressant)
,Noun sedative has 1 sense
  1. sedative, sedative drug, depressant, downer - a drug that reduces excitability and calms a person
    --1 is a kind of medicine, medication, medicament, medicinal drug; drug of abuse, street drug
    --1 has particulars:
     benzodiazepine; bromide; chloral hydrate; glutethimide, Doriden; sedative-hypnotic, sedative-hypnotic drug