堅けん陣じん

noun

stronghold; impregnable position

Refers to a firmly defended military position or, by extension, an unassailable stance in debate or competition. Somewhat formal and often used in strategic contexts.

• 敵てき軍ぐんは堅けん陣じんを築きずいて待まち構かまえていた。

  The enemy forces had built a stronghold and were lying in wait.

• 彼かれの議ぎ論ろんは堅けん陣じんで、反はん論ろんの余よ地ちがなかった。

  His argument was an impregnable position, leaving no room for rebuttal.