His behavior was not acceptable in a professional setting.
not allowed
Frequency:
65
%
Cameras are not allowed inside the museum.
not appropriate
Frequency:
60
%
His jokes were not appropriate for the occasion.
not permitted
Frequency:
55
%
Smoking is not permitted in this area.
not valid
Frequency:
50
%
The coupon code entered is not valid.
Idiomatic Expressions for not kosher
Phrase: That deal is not kosher
Meaning: That deal is not honest or fair
Usage: I don't trust that business partner, I have a feeling that deal is not kosher.