noun (n)

• (psychiatry) a relatively permanent state of worry and nervousness occurring in a variety of mental disorders, usually accompanied by compulsive behavior or attacks of panic(noun.state)

  Synonym:
  anxiety
  

  source: wordnet30
• a feeling of mild anxiety about possible developments(noun.feeling)

  Synonym:
  disquiet
  

  source: wordnet30
• The quality of being anxious; great solicitude; anxiety.(noun)

  source: webster1913