1. Not affected by a chemical substance (especially alcohol)
   "The designated driver remained sober throughout the night"
    
2. Dignified and sombre in manner or character and committed to keeping promises
   "as sober as a judge";
   - grave, sedate, solemn
    
3. Completely lacking in playfulness
   "The stern teacher's sober demeanour intimidated the students";
   - unplayful, serious
    
4. Lacking brightness or colour; dull
   "sober Puritan grey";
   - drab, somber [US], sombre [Brit, Cdn]
    
5. Moderate or reasonable
   "He made a sober assessment of the situation"

1. Become sober after excessive alcohol consumption
   "Keep him in bed until he sobers up";
   - sober up
    
2. Become more realistic
   "After thinking about the potential consequences of his plan, he sobered up";
   - sober up
    
3. Cause to become sober
   "A sobering thought"

Derived forms: sobered, soberest, sobers, soberer, sobering

See also: cold sober, colorless [US], colourless [Brit, Cdn], drug-free, dry, fun, playfulness, serious, stone-sober, teetotal, uninebriated, unintoxicated

Type of: alter, become, change, get, go, modify

Antonym: playful, ripped [informal]

Encyclopedia: Sober, Spain