noun-modifying (irregular)
Classical Japanese prenominal adjective (連体形 of 猛し). Used in literary or poetic contexts to describe a person or spirit as bold, fearless, or ferocious. Not used in modern conversational Japanese.
猛き者たちが戦場に立った。
The valiant ones stood on the battlefield.
猛き心を持って進め。
Advance with a fierce heart.