This is the 2089th most frequent Japanese word.
否め
"否め" refers to "negation" or "denial" in English, derived from the verb "否める" meaning "to deny."
Here, "否め" (inamedu) is used in its masen negation form "否めません" to articulate the inability to deny the difficulty.
このプロジェクトの難しさは否めません。
The difficulty of this project is undeniable.
"否めない" (inamenai) is employed to express a strong likelihood that his results are irrefutable.
彼の努力の成果は否めないだろう。
His effort's success is probably undeniable.
"否めない" is used attributively to point out aspects that cannot be simply refuted in German, emphasizing the logical sharpness.