English to English

noun (n)

• the psychological state of being irritated or annoyed(noun.state)

  Synonym:
  annoyance, irritation, vexation
  

  source: wordnet30
• something or someone that causes trouble; a source of unhappiness(noun.cognition)

  Synonym:
  annoyance, bother, infliction, pain, pain in the ass, pain in the neck
  

  source: wordnet30
• The act of bothering, or state of being bothered; cause of trouble; perplexity; annoyance; vexation.(noun)

  source: webster1913