sober

Adjective

• completely lacking in playfulness

• lacking brightness or color; dull
  • drab faded curtains
    
  • sober Puritan grey
    
  • children in somber brown clothes
    

• 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
    

• not affected by a chemical substance (especially alcohol)

Verb

• become sober after excessive alcohol consumption
  • Keep him in bed until he sobers up
    

• become more realistic
  • After thinking about the potential consequences of his plan, he sobered up
    

• cause to become sober
  • A sobering thought
    

Related words

• Synonyms: 
  unplayful , serious , drab , somber , sombre , grave , sedate , solemn , sober up
• Antonyms: 
  playful , intoxicated , drunk , inebriated