Answer: folly

AnswerCrossword Clue
FOLLY

Unwise undertaking

FOLLY

Thoughtless act.

FOLLY

"'Tis ... to be wise"

FOLLY
Unwise behavior
FOLLY
Jackassery
FOLLYLack of good sense
FOLLYBad move
FOLLYImprudence
FOLLYUnreason
FOLLYUnprofitable undertaking.
FOLLYHuge mistake
FOLLYSeward's purchase, it was said
FOLLYSeward s ...
FOLLYCraziness
FOLLYImbecility
FOLLYFoolish move
FOLLYWhimsical addition to an English garden
FOLLYSenselessness
FOLLYFoolish act.
FOLLYWant of good sense.
FOLLYLack of good sense.
FOLLYImprudence.
FOLLYImprudent undertaking
FOLLYAbsurd idea
FOLLYMisguided act
FOLLYFoolishness
FOLLYNonsensical act
FOLLYAbsurdity
FOLLYSupreme stupidity
FOLLYSeward's Alaska purchase, to some
FOLLYMadness
FOLLYIndiscretion
FOLLYUnwise investment