expression, pre-noun adjectival
deep-rooted; ineradicable; indispensable
Literary pre-noun modifier meaning something that cannot be removed or is essential. Often used with nouns like 疑い (suspicion) or 存在 (presence).
See also: 抜きがたい
彼に対する抜くべからざる疑いが残っている。
A deep-rooted suspicion about him remains.
このプロジェクトには抜くべからざる人材だ。
He is an indispensable person for this project.