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
- death-head
- death house
- death-hunter
- deathify
- death-in-life
- death instinct
- mid-management
- mid-market
- mid-morn
- mid-morning
- midmost
- Midn.
- midnight
- midnight basketball
- midnight black
- midnight blue
- midnight cowboy
- midnight feast
- midnight hour
- midnight lamp
- midnightly
- midnight Mass
- midnight matinée
- midnight movie
- midnight oil