Merriam-Webster Online Dictionary
monster (noun)1.
a) an animal or plant of abnormal form or structure
b) one who deviates from normal or acceptable behavior or character
2.
a threatening force
3.
a) an animal of strange or terrifying shape
b) one unusually large for its kind
4.
something - monstrous , especially a person of unnatural or extreme ugliness, deformity, wickedness, or cruelty
5.
one that is highly successful
enormous or impressive especially in size, extent, or numbers
Merriam-Webster Online Thesaurus
monster (adjective)unusually large
SYNONYMS:
astronomical ( astronomic), Brobdingnagian, bumper, colossal, cosmic ( cosmical), cyclopean, elephantine, enormous, galactic, gargantuan, giant, gigantesque, gigantic, grand, herculean, heroic ( heroical), Himalayan, humongous ( humungous), immense, jumbo, king-size ( king-sized), leviathan, mammoth, massive, mega, mighty, monster, monstrous, monumental, mountainous, oceanic, pharaonic, planetary, prodigious, super, super-duper, supersize, supersized, titanic, tremendous, vast, vasty, walloping, whacking, whoppingRELATED WORDS:
big, bulky, considerable, extensive, good, goodly, great, gross, handsome, hefty, hulking, largish, major, outsize ( outsized), overgrown, oversize ( oversized), sizable ( sizeable), substantial, tidy, voluminous; august, formidable, grandiose, imposing, lofty, majestic; cavernous, monolithic, overwhelming, staggering, stupendous, towering; boundless, immeasurable, infiniteNEAR ANTONYMS:
little, mini, petite, pint-size ( pint-sized), puny, small, smallish, undersized ( undersize); dinky, dwarfish, half-pint1.
a strange or horrible and often frightening creature
SYNONYMS:
grotesque, grotesquerie ( grotesquery), monstrosity, ogreRELATED WORDS:
ogress; Frankenstein; bête noire, bogey ( bogie bogy), bugaboo, bugbear; banshee, bogeyman ( bogyman), demon ( daemon), devil, fiend, fright, imp, incubus; horror, terror; abomination, anathema; abnormality, freak; mutant, mutation2.
a person, thing, or event that is far from normal
SYNONYMS:
abnormality, anomaly, monster, monstrosityRELATED WORDS:
abortion, malformation, miscreation, mutant, mutation; character, crackbrain, crackpot, crank, eccentric, kook, nut, oddball, screwball, weirdo; aberrant, deviant; individualist, maverick, nonconformist; curiosity, peculiarity, singularity; aberration, exception, irregularity, oddity, rarityNEAR ANTONYMS:
sample, specimen; commonplace, usual3.
a mean, evil, or unprincipled person
SYNONYMS:
baddie ( baddy), beast, brute, caitiff, devil, evildoer, fiend, heavy, hound, knave, meanie ( meany), miscreant, monster, nazi, no-good, rapscallion, rascal, reprobate, rogue, savage, scalawag ( scallywag), scamp, scapegrace, scoundrel, varlet, wretchRELATED WORDS:
villainess; blackguard; criminal, crook, culprit, felon, lawbreaker, malefactor, offender, perp, perpetrator, transgressor; sinner, trespasser, wrongdoer; cad, heel, serpent, snake, viper; bandit, bravo, desperado, outlaw; con, convict, jailbird; assassin, cutthroat, gangster, goon, gunman, hoodlum, hooligan, racketeer, ruffian, thug; rough, rowdy, tough; loser, lowlife, ne'er-do-well, stinker, trashNEAR ANTONYMS:
angel, innocent, saint; hero4.
something large of its kind
SYNONYMS:
behemoth, blockbuster, colossus, dinosaur, dreadnought, elephant, Goliath, jumbo, leviathan, mammoth, mastodon, monster, titan, whale, whopperRELATED WORDS:
amazon, giantess; bulk, hulk; heavyweight; juggernaut, steamrollerNEAR ANTONYMS:
lightweight, weakling, wimp, wisp; nonentity, twerp, whippersnapper