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Definition of monster : 1. Any thing or person of unnatural or excessive ugliness, deformity, wickedness, or cruelty.
2. Monstrous in size.
3. Something of unnatural size, shape, or quality; a prodigy; an enormity; a marvel.
4. Specifically , an animal or plant departing greatly from the usual type, as by having too many limbs.
5. To make monstrous.

Synonyms:

monstrosity, titanic, vast, heavyweight, phoenix, gigantesque, giant star, heller, pythonic, immense, walloping, Brobdingnagian, titan, massy, Bunyanesque, Lusus Naturae, gargantuan, mountainous, big, dickens, monstrous, whopper, abnormality, tremendous, stupendous, addict, nut, jumbo, Herculean, heroic, kind, the Tempter, gigantic, teras, fanatic, mammoth, junky, massive, deuce, mighty, daimon, colossal, prodigious, enormous, tiger, behemoth, giant, junkie, whopping, Cyclopean, monumental, mastodonic, goliath, whale, usual, salamander, hulk, huge, elephantine, leviathan, colossus

evil spirit (part of speech: noun)

genie, nixie, hellion, goblin, archfiend, imp, hell-raiser, gnome, dwarf, dragon, siren, Satan, lamia, sylph, demon, fiend, hell hound, freak, nymph, sprite, satyr, devil, beast, hellcat

ghost (part of speech: noun)

daemon, werewolf, apparition, bugbear, succubus, horror, myth, Frankenstein, shadow, ghoul, specter, chimera, illusion, Dracula, bogey man, nightmare, incubus, phantasm, phantom, spirit, ogre, ghost, terror, bugaboo, hobgoblin, vampire

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

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