Whimsy suggests playful or quirky actions done on a moment's impulse, rather than pre-planned. On a whim, she added a touch of whimsy to the dinner by serving dessert first.
Pro Tip 2/3
Impractical Fun
Actions or ideas described as whimsy are often impractical and meant for fun, not serious outcomes. His whimsical solution to boredom was building a pillow fort.
Pro Tip 3/3
Subtle Humor
Whimsy often contains an element of humor or silliness that is subtle, not overtly funny. Her whimsical comments during meetings always lightened the mood.