noun (n)

• the state of being sober and not intoxicated by alcohol(noun.state)

  Synonym:
  sobriety
  Antonym:
  drunkenness, inebriation, inebriety, insobriety, intoxication, tipsiness
  

  source: wordnet30
• a manner that is serious and solemn(noun.attribute)

  Synonym:
  graveness, gravity, sobriety, somberness, sombreness
  

  source: wordnet30
• The quality or state of being sober.(noun)

  source: webster1913