1. [adjective] Not drunk; not intoxicated
2. [adjective] Not given to excessive drinking of alcohol
3. [adjective] Moderate; realistic; serious; not playful; not passionate; cool; self-controlled
4. [adjective] Dull; not bright or colorful
5. [adjective] Subdued; solemn; grave
6. [verb] (often with up) To make or become sober.
7. [verb] (often with up) To overcome or lose a state of intoxication.
8. [verb] Cause to become sober; 'A sobering thought'.
9. [verb] Become more realistic; 'After thinking about the potential consequences of his plan, he sobered up'.
10. [verb] Become sober after excessive alcohol consumption; 'Keep him in bed until he sobers up'.
11. [adjective] Not affected by a chemical substance (especially alcohol).
12. [adjective] 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'.
13. [adjective] Lacking brightness or color; dull; 'drab faded curtains'; 'sober Puritan grey'; 'children in somber brown clothes'.
14. [adjective] Completely lacking in playfulness.