noun (n)

• the state of having good sense and sound judgment(noun.state)

  Synonym:
  rationality, reason
  

  source: wordnet30
• goodness of reason and judgment(noun.attribute)

  Example:
  The judiciary is built on the reasonableness of judges.
  

  source: wordnet30
• the property of being moderate in price or expenditures(noun.attribute)

  Example:
  The store is famous for the reasonableness of its prices.
  

  Synonym:
  moderateness, modestness
  

  source: wordnet30
• moderation in expectations(noun.attribute)

  Example:
  Without greater reasonableness by both parties we will never settle this matter!.
  

  source: wordnet30
• the quality of being plausible or acceptable to a reasonable person(noun.attribute)

  Synonym:
  tenability, tenableness
  

  source: wordnet30
• Quality of being reasonable.(noun)

  source: webster1913