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
- child's-eye view
- child's game
- childship
- child-size
- child-sized
- child's part
- child's play
- child's pose
- child star
- child study
- child support
- Child Support Agency
- child trafficker
- child trafficking
- child welfare
- childwife
- childwite
- child within
- child-woman
- child worker
- Chile
- Chilean
- chile ancho
- chile con queso
- chile mulato