1. (

• caprice ,
• impulse ,
• whim

) a sudden desire; "he bought it on an impulse" ;

2. (

• notion ,
• whim ,
• whimsy ,
• whimsey

) 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" ;