in no uncertain terms

慣用表現

(idiomatic) (of a statement, especially a threat or admonishment) Bluntly, forthrightly; explicitly, categorically.

日本語の意味

はっきりと、明確に（曖昧さなく断固と伝える意） / 率直に、あからさまに（特に脅しや戒めなどの文脈で）

The coach told the team in no uncertain terms that poor effort would not be tolerated.

コーチはチームに対して、努力不足は容認しないとはっきり告げた。

意味（1）

(idiomatic) (of a statement, especially a threat or admonishment) Bluntly, forthrightly; explicitly, categorically.