Answer: idontknow

AnswerCrossword Clue
IDONTKNOW

Nonresponsive response

IDONTKNOW

"Beats me!"

IDONTKNOW

Answer a teacher doesn't want to hear

IDONTKNOW
A shrug, verbalized
IDONTKNOW
"Search me"
IDONTKNOW"You got me"
IDONTKNOWWhat a shrug might mean
IDONTKNOWToo-seldom-heard reply
IDONTKNOW"Beats me"