whimsynoun
uk/ˈwɪm.zi/us/ˈwɪm.zi/[ U ] unusual, funny, and pleasant ideas or qualities:
Add a touch of whimsy to your room with these cat sculptures.
The film combines whimsy and tragedy in equal measure.
[ C or U ] UK disapproving something that is intended to be strange and humorous but in fact has little real meaning or value:
Personally I've always considered mime to be a lot of whimsy.
[ C ] US also whim a sudden wish or idea, especially one that cannot be reasonably explained:
Is this just one of his whimsies?