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.
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)
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
- " What a monster for poor Glynne to be engaged to. - "The Star-Gazers", George Manville Fenn.
- She then very nearly understood what species of moral monster M. de Camors was. - "Monsieur de Camors, v3", Octave Feuillet.
- The girl who looked at me from this one appeared to be a monster. - "A Diary Without Dates", Enid Bagnold.