noun (n)

• uneasiness about the fitness of an action(noun.feeling)

  Synonym:
  misgiving, scruple
  

  source: wordnet30
• a mild state of nausea(noun.state)

  Synonym:
  queasiness, squeamishness
  

  source: wordnet30
• Sickness; disease; pestilence; death.(noun)

  source: webster1913