folly

US /ˈfɑː.li/
UK /ˈfɑː.li/
"folly" picture
1.

folie, sottise

lack of good sense; foolishness

:
It would be folly to ignore his advice.
Ce serait une folie d'ignorer ses conseils.
The decision to build the bridge there was an act of sheer folly.
La décision de construire le pont là-bas était un acte de pure folie.
2.

folie, fabrique

a costly ornamental building with no practical purpose, especially one built in a large garden or park

:
The estate featured a beautiful Gothic folly.
Le domaine présentait une magnifique folie gothique.
Many grand country houses had architectural follies in their grounds.
De nombreuses grandes maisons de campagne avaient des folies architecturales sur leurs terrains.