evil spirit (part of speech: noun)
hell hound, siren, ghoul, daemon, monster, archfiend, hell-raiser, Satan, specter, hellcat, ogre, sprite, imp, hellion, nixie, dragon, hobgoblin, incubus, werewolf, spirit, beast, goblin, demon, lamia, satyr, sylph, genie, devil, vampire, succubus, gnome, nymph, dwarf
enthusiast (part of speech: noun)
evildoer (part of speech: noun)
gunman, thug, snake, hooligan, bad guy, terrorist, ruffian, hoodlum, cutthroat, crook, viper, tyrant, thief, wrongdoer, bully, desperado, law breaker, evildoer, tough, vulture, vandal, criminal, brute, scoundrel
lunatic (part of speech: noun)
Satan (part of speech: noun)
- Why, there is no danger of getting a seat just behind a window fiend. - "Daybreak: A Romance of an Old World", James Cowan.
- Pelisson shrugged his shoulders, as he whispered in Fouquet's ear, " That woman is a perfect fiend." - "Louise de la Valliere", Alexandre Dumas, Pere.
- The angel had been there all the time that the fiend was, of course. - "The Flirt", Booth Tarkington.