2. (verb)grave, sedate, sober, solemn dignified and somber in manner or character and committed to keeping promises Synonyms: severe, sober, serious, somber, earnest, sincere, dangerous, staid, unplayful, weighty, grave, grievous, drab, sedate, life-threatening, solemn, heavy, sombre Antonyms: indecorous, indelicate, frivolous, energise, perk up, energize, stimulate, arouse, brace
3. (verb)sedate, calm, tranquilize, tranquillize, tranquillise cause to be calm or quiet as by administering a sedative to Synonyms: tranquilize, tranquillize, becalm, tranquillise, still, chill out, quiet, sedate, cool off, cool it, simmer down, steady, settle down, calm, lull, calm down, quieten Antonyms: frivolous, indelicate, indecorous, brace, arouse, energize, energise, stimulate, perk up
Synonyms, Thesaurus & Antonyms of 'sedate'
English Synonyms and Antonyms
1. sedate That is calm which is free from disturbance or agitation; in the physical sense, free from violent motion or action; in the mental or spiritual realm, free from excited or disturbing emotion or pas Synonyms: calm, collected, imperturbable, sedate, still, composed, peaceful, self-possessed, tranquil, cool, placid, serene, undisturbed, dispassionate, quiet, smooth, unruffled Antonyms: agitated, excited, frenzied, passionate, ruffled, violent, boisterous, fierce, furious, raging, stormy, wild, disturbed, frantic, heated, roused, turbulent, wrathful
Synonyms for sedate 
