folly

US /ˈfɑ:li/

UK /ˈfɒli/

B1

noun

  • Bad judgment or stupidity; madness
  • A costly ornamental building with no practical purpose, especially a tower or mock-Gothic ruin built in a large garden or park.
  • Lack of good sense; foolishness.
  • A costly ornamental building with no practical purpose, especially a tower or mock-Gothic ruin built in a large garden or park.

other

  • Lack of good sense; foolishness.