an evil spirit; devil or fiend.

an evil passion or influence.

a person considered extremely wicked, evil, or cruel.

a person with great energy, drive, etc.

He's a demon for work.

a person, esp. a child, who is very mischievous

His younger son is a real little demon.

daemon.

Australian Slang . a policeman, esp. a detective.

of, pertaining to, characteristic of, or noting a demon.

possessed or controlled by a demon.

noun

angel , god

noun

archfiend , beast , brute , fiend , goblin , hellion , imp , incubus , little devil , malignant spirit , monster , rascal , rogue , satan , succubus , vampire , villain , demoniac , devil , diligent , energumen , evil , genie , ghoul , hag , mara , ogre , skillful , warlock , witch