whim

Noun

• an odd or fanciful or capricious idea
  • the theatrical notion of disguise is associated with disaster in his stories
    
  • he had a whimsy about flying to the moon
    
  • whimsy can be humorous to someone with time to enjoy it
    

• a sudden desire
  • he bought it on an impulse
    

Related words

• Synonyms: 
  notion , whimsy , whimsey , caprice , impulse