Definition of folly
1 : lack of good sense or normal prudence and foresight his folly in thinking he could not be caught
2a : criminally or tragically foolish actions or conduct
3 : a foolish act or idea The prank was a youthful folly.
4 : an excessively costly or unprofitable undertaking Paying so much for that land was folly, since it was all rocks and scrub trees.
5 : an often extravagant picturesque building erected to suit a fanciful taste
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