<p><strong>Adjective</strong></p><ul><li>Medicine/Medical: having the quality of depressing or lowering the vital activities; sedative.</li><li>causing a lowering in spirits; dejecting.</li><li>causing a drop in value; economically depressing.</li><li>depressing.</li></ul><p><strong>Noun</strong></p><ul><li>Medicine/Medical: a sedative.</li><li>Compare stimulant (def 1).</li><li>Chemistry: any agent capable of diminishing a specific property of a substance.</li></ul>