in no uncertain terms

in no uncertain terms

Very explicitly and emphatically. He told me in no uncertain terms that if it happens again, I'll be expelled. There is no doubt. The contract states, in no uncertain terms, what must happen in cases like this.
See also: no, term
Farlex Dictionary of Idioms.

in no uncertain terms

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.
See also: no, term
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

in no uncertain terms

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.
See also: no, term
The American Heritage® Dictionary of Idioms by Christine Ammer.

in no uncertain terms

If someone tells a person something in no uncertain terms, they say it strongly and clearly so that there is no doubt about what they mean. She told him in no uncertain terms to go away.
See also: no, term
Collins COBUILD Idioms Dictionary, 3rd ed.

in no uncertain terms

clearly and forcefully.
1991 Kaye Gibbons A Cure for Dreams My mother got the doctor back out to our house and told him in no uncertain terms to do what he was paid to do.
See also: no, term
Farlex Partner Idioms Dictionary

in ˌno unˌcertain ˈterms

clearly and forcefully: I told him in no uncertain terms what I thought of his behaviour.
See also: no, term
Farlex Partner Idioms Dictionary

in no uncertain terms

Emphatically, very clearly. This double negative appears to have become very popular about the middle of the twentieth century. Lawrence Durrell used it in Balthazar (1958): “I told Abdul so in no uncertain terms.” A slightly slangier synonym is loud and clear.
See also: no, term
The Dictionary of Clichés by Christine Ammer
See also:
  • in so many words
  • in so/as many words
  • (I'll) see you when I see you
  • clean (one's) act up
  • clean act up
  • clean one’s act up
  • clean up (one's) act
  • clean up act
  • clean up your act
  • howl with (something)
References in periodicals archive
While the Commissioner admired this good citizen's "noble intentions" he was told in no uncertain terms to stop immediately.
Protect the victims not the thieves
As expected Arteta squared up to take it when Yakubu, who had failed to make an impression in the first half, snatched the ball away and told Mikel in no uncertain terms that he was taking this one.
Punished after missing chances; BARCLAYS PREMIER LEAGUE VIEW FROM THE STANDS