To express something in no uncertain terms means to express it very explicitly and emphatically, which is what the speaker did.
Context: I had expressed to him clearly and forcefully that I doubted my ability to keep up with his style of life.
Hypothesis: I had expressed to him in no uncertain terms that I doubted my ability to keep up with his style of life.

Given this context, determine if the hypothesis is true (Yes, no, or unknown)?