noun (n)

• a position of inferior status; low in station or rank or fortune or estimation(noun.state)

  Synonym:
  low status, lowliness
  Antonym:
  high status
  

  source: wordnet30
• a feeling of low spirits(noun.feeling)

  Example:
  He felt responsible for her lowness of spirits.
  

  Synonym:
  dejectedness, dispiritedness, downheartedness, low-spiritedness
  

  source: wordnet30
• the quality of being low; lacking height(noun.attribute)

  Example:
  He was suddenly aware of the lowness of the ceiling.
  

  Antonym:
  highness, loftiness
  

  source: wordnet30
• a low or small degree of any quality (amount or force or temperature etc.)(noun.attribute)

  Example:
  He took advantage of the lowness of interest rates.
  

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

  source: webster1913