sedate

Meanings

• cause to be calm or quiet as by administering a sedative to
  • "The patient must be sedated before the operation"
• characterized by dignity and propriety
• dignified and somber in manner or character and committed to keeping promises
  • "a quiet sedate nature"

Synonyms

calm, grave, sober, solemn, staid, tranquilize, tranquillise, tranquillize