Crossword Genius

You shouldn't do this

Ross

I believe the answer is:

nono

(Other definitions for nono that I've seen before include "Unacceptable thing" , "Impossibility" , "Something totally unacceptable (informal)" , "Something not acceptaable" , "Failure (colloq.)" .)

I've seen this clue in The New York Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.