stupid
A lot of the money was spent stupidly.
It is stupidly easy to buy the drug online.
I stupidly went outside to see what was happening.

SMART Vocabulary: related words and phrases

Stupid and silly
absurd
absurdity
absurdly
adolescent
against your better judgmentidiom
dopey
dopily
dorky
dottiness
dotty
imprudently
in his/her/their wisdomidiom
in someone's infinite wisdomidiom
inadvisable
injudicious
uncritical
uncritically
undiscriminating
unintelligent
unperceptive