He is as ruthless as a devil.
そのゲームには強力な悪魔が登場する。
A powerful demon appears in that game.
Specifically the Devil in Christian contexts; often used with the definite article in English.
See also: サタン
キリスト教では、悪魔は神に敵対する存在とされる。
In Christianity, the Devil is considered an adversary of God.
Māra; evil forces hindering enlightenment
Buddhist term for the demonic forces or temptations that obstruct spiritual progress.
仏教では、修行者の悟りを妨げるものを悪魔と呼ぶことがある。
In Buddhism, things that hinder a practitioner's enlightenment are sometimes called Māra.
He suddenly went wild, as if possessed by a devil.
The man made a pact with the devil to gain power.
He is said to have sold his soul to the devil for success.
She wore a devilish smile.
悪魔 is the general Japanese word for any devil or demon, whereas ルシファー is used for a specific devilish figure in a more literary or foreign-flavored way.
悪魔 refers to a devil or demon, a distinct malevolent being, while 悪霊 is specifically the spirit of something that died.
charm against evil spirits; talisman; amulet
Satanism; devil worship