He is as ruthless as a devil.
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
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.
In Buddhism, things that hinder a practitioner's enlightenment are sometimes called Māra.
He suddenly went wild, as if possessed by a devil.
She wore a devilish smile.
The man made a pact with the devil to gain power.
He is said to have sold his soul to the devil for success.
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