plural follies
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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Merriam-Webster unabridged
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Time Traveler for folly
The first known use of folly was in the 13th century
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