vexation

Noun

• the act of troubling or annoying someone

• something or someone that causes anxiety; a source of unhappiness
  • New York traffic is a constant concern
    
  • it's a major worry
    

• the psychological state of being irritated or annoyed

• anger produced by some annoying irritation

Related words

• Synonyms: 
  annoyance , annoying , irritation , concern , worry , headache , botheration , chafe