Cliché in very specific and direct language. I was so mad. I told her in no uncertain terms to leave and never come back.I told him in no uncertain terms to stop calling me.
if someone tells you something in no uncertain terms, they say it in a strong and direct way We were told in no uncertain terms that dishonesty would not be tolerated.
Emphatically, definitely so. For example, Jane told them in no uncertain terms that she wanted no part of their practical joke. The double negative in this idiom serves for emphasis. [Mid-1900s] Also see in so many words.