sedate, calm, tranquilize, tranquillize, tranquillise -- (cause to be calm or quiet as by administering a sedative to; "The patient must be sedated before the operation")
Overview of adj sedate
The adj sedate has 2 senses
sedate, staid -- (characterized by dignity and propriety)
grave, sedate, sober, solemn -- (dignified and somber in manner or character and committed to keeping promises; "a grave God-fearing man"; "a quiet sedate nature"; "as sober as a judge"; "a solemn promise"; "the judge was solemn as he pronounced sentence")