noun (n)

• the state of being subject to danger or injury(noun.state)

  Antonym:
  security
  

  source: wordnet30
• the anxiety you experience when you feel vulnerable and insecure(noun.feeling)

  source: wordnet30
• The condition or quality of being insecure; want of safety; danger; hazard; as, the insecurity of a building liable to fire; insecurity of a debt.(noun)

  source: webster1913