noun (n)

• relatively small dimension through an object as opposed to its length or width(noun.attribute)

  Example:
  The tenuity of a hair.
  

  Synonym:
  slenderness, thinness
  Antonym:
  thickness
  

  source: wordnet30
• a rarified quality(noun.attribute)

  Example:
  The tenuity of the upper atmosphere.
  

  Synonym:
  low density, rarity
  

  source: wordnet30
• the quality of lacking intensity or substance(noun.attribute)

  Example:
  A shrill yet sweet tenuity of voice.
  

  Synonym:
  feebleness
  

  source: wordnet30
• The quality or state of being tenuous; thinness, applied to a broad substance; slenderness, applied to anything that is long; as, the tenuity of a leaf; the tenuity of a hair.(noun)

  source: webster1913