no-no ( synonym found)
Definition of no-no:

(n) : something that is forbidden, prohibited, discouraged or taboo; a no-hitter, a game in which no batter on one of the teams got a hit
"smoking indoors is becoming a real no-no these days, in many places."
Definition of no-no:

(n) : something that is forbidden, prohibited, discouraged or taboo; a no-hitter, a game in which no batter on one of the teams got a hit
"smoking indoors is becoming a real no-no these days, in many places."
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