Sedate

прилагательное спокойный, степенный, уравновешенный Например: sedate temper — спокойный характер Синоним(ы): grave, sober, solemn, dignified Антоним(ы): easygoing, frivolous, jaunty, light-hearted

Большой англо-русский словарь

Sedate

I. adjective Etymology: Latin sedatus, from past participle of sedare to calm; akin to sedēre to sit — more at sit keeping a quiet steady attitude or pace; unruffled Synonyms: see serioussedately adverbsedateness noun II. transitive verb (sedated; sedating) Etymology: back-formation from sedative to dose with sedatives

Merriam-Webster's Collegiate Dictionary