no-no 
noun (plural no-nos) informal
A thing that is not possible or acceptable: perming highlighted hair used to be a definite no-no, but it’s now possible...
- So an office at that end of the building is a definite no-no as the droning hum could drive me mad.
- That sort of event was a definite no-no and he worked hard to prevent such things.
- Wiggling out was a definite no-no since he had already made sure that I had nowhere else to turn to.
Rhymes
- anyone
- anyone's game
- any other business
- anyplace
- any port in a storm
- any road (up)
- anything
- anything but
- anything like ——
- anytime
- any time (also anytime)
- any time (or day or minute etc.) now
- Anytown
- anyway
- any way (or however) you slice it
- anyways
- anywhere
- anywhere near
- anywheres
- anywise
- Anzac
- Anzac biscuit
- Anzac Cove
- Anzac Day
- Anzio