I. si-ˈdāt adjective
Etymology: Latin sedatus, from past participle of sedare to calm; akin to sedēre to sit — more at sit
Date: 1663
: keeping a quiet steady attitude or pace : unruffled
Synonyms: see serious
• se·date·ly adverb
• se·date·ness noun
II. transitive verb
( se·dat·ed ; se·dat·ing )
Etymology: back-formation from sedative
Date: 1945
: to dose with sedatives