Crossword Genius

Senseless undertaking (5)

Ross

I believe the answer is:

folly

(Other definitions for folly that I've seen before include "Foolish thing" , "Stupidity - false building" , "'Madness, stupidity (5)'" , "Foolishness" , "'Where ignorance is bliss. 'tis . . . . . to be wise'" .)

I've seen this clue in the USA Today.
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