暗あん愚ぐ

na-adjective, noun

foolish; imbecilic; feebleminded

A formal, somewhat literary term for a lack of intelligence or wisdom, often used in historical or critical contexts. Not a casual insult.

• その暗あん愚ぐな政せい策さくは国くにを危き機きに陥おとしいれた。

  That foolish policy plunged the country into crisis.

• 彼かれは暗あん愚ぐの君くん主しゅとして歴れき史しに名なを残のこした。

  He went down in history as a feebleminded monarch.