noun
treacherous enemy; formidable foe
Refers to an enemy who is both powerful and treacherous; often used in historical or literary contexts.
彼は生涯の梟敵としてその名を歴史に刻んだ。
He etched his name in history as a lifelong treacherous enemy.
この戦いで、ついに梟敵を討ち取った。
In this battle, they finally defeated their formidable foe.