noun (n)

• (of hair) lack of a tendency to curl(noun.attribute)

  Antonym:
  curliness, waviness
  

  source: wordnet30
• freedom from crooks or curves or bends or angles(noun.attribute)

  Antonym:
  crookedness
  

  source: wordnet30
• trueness of course toward a goal(noun.attribute)

  Synonym:
  directness
  Antonym:
  indirectness
  

  source: wordnet30
• having honest intentions(noun.attribute)

  Synonym:
  good faith
  

  source: wordnet30
• a sexual attraction to (or sexual relations with) persons of the opposite sex(noun.act)

  Synonym:
  heterosexualism, heterosexuality
  

  source: wordnet30
• The quality, condition, or state, of being straight; as, the straightness of a path.(noun)

  source: webster1913
• A variant of Straitness.(noun)

  source: webster1913