capricious humor or disposition; extravagant, fanciful, or excessively playful expression

a play with lots of whimsy.

an odd or fanciful notion.

anything odd or fanciful; a product of playful or capricious fancy

a whimsy from an otherwise thoughtful writer.

noun

bee , boutade , caprice , conceit , freak , humor , impulse , megrim , notion , vagary , whim , idea , quality , thought