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Definition of fiend : An implacable or malicious foe; one who is diabolically wicked or cruel; an infernal being; - applied specifically to the devil or a demon.

Synonyms:

heller, giant, kind, fanatic, daimon, colossus, monstrosity, behemoth, goliath, lusus naturae, bug, the Tempter, teras, demigod, concern, barbarian, tiger, dickens

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

aficionado, supporter, devotee, freak, enthusiast, fan, zealot, nut, fancier, patron, addict, buff, connoisseur

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

kook, maniac, crackpot, psychotic, madman, crazy, crank, psychopath, lunatic, neurotic

deuce, Mephistopheles, serpent, Lucifer, Beelzebub

Usage examples:

• 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.