Monstrous1. (a.) Marvelous; strange.
2. (a.) Having the qualities of a monster; deviating greatly from the natural form or character; abnormal; as, a monstrous birth.
3. (a.) Extraordinary in a way to excite wonder, dislike, apprehension, etc.; -- said of size, appearance, color, sound, etc.; as, a monstrous height; a monstrous ox; a monstrous story.
4. (a.) Extraordinary on account of ugliness, viciousness, or wickedness; hateful; horrible; dreadful.
5. (a.) Abounding in monsters.
6. (adv.) Exceedingly; very; very much.
Thesaurus Entries
Atlantean, Brobdingnagian, Cyclopean, Gargantuan, Herculean, Homeric, a bit much, abandoned, abject, abominable, absurd, abysmal, amplitudinous, appalling, arrant, astronomic, astronomical, atrocious, awesome, awful, awfully, bad, bandy, bandy-legged, barbaric, barbarous, baroque, base, beastly, beggarly, beneath contempt, beyond belief, big, bizarre, black, blamable, blameworthy, blemished, bloated, boundless, bowlegged, brutal, brutish, bulky, cacogenic, cheesy, club-footed, cockamamie, colossal, contemptible, cosmic, cracking, crazy, criminal, cruel, crummy, crying, damnable, dark, debased, defaced, deformed, degraded, deplorable, depraved, desperate, despicable, detestable, dire, dirty, disfigured, disgraceful, disgusting, dreadful, dwarfed, egregious, elephantine, enormous, epic, evil, exaggerated, excessive, execrable, exorbitant, extensive, extravagant, extreme, extremely, fabulous, fancy, fantastic, fateful, fetid, fiendish, filthy, flagitious, flagrant, flatfooted, foolish, foul, freak, freakish, frightful, fulsome, galactic, gargantuan, gargoylish, ghoulish, giant, giantlike, gigantic, glaring, gluttonous, grandiose, grave, grievous, grisly, gross, grotesque, gruesome, hateful, heinous, hellish, heroic, hideous, high, high-flown, horrendous, horrible, horrid, horrific, horrifying, huge, hyperbolic, hypertrophied, ill-made, ill-proportioned, ill-shaped, immeasurable, immense, immoderate, impressive, improper, incontinent, incredible, infamous, infinite, inhuman, iniquitous, inordinate, insensitive, intemperate, jumbo, king-size, knavish, knock-kneed, lamentable, large, laughable, little, loathsome, lousy, low, low-down, ludicrous, lumpen, magnificent, malformed, mammoth, mangy, marred, massive, massy, mean, measly, merciless, mightily, mighty, misbegotten, miserable, misproportioned, misshapen, monster, monumental, mortal, mountainous, mutilated, nasty, naughty, nauseating, nauseous, nefarious, noisome, nonsensical, notorious, obnoxious, odious, offensive, ominous, out of bounds, out of shape, out of sight, outrageous, outre, outsize, overbig, overdeveloped, overgreat, overgrown, overlarge, overmuch, overweening, paltry, peccant, petty, pigeon-toed, pitiable, pitiful, poky, poor, poppycockish, portentous, preposterous, prodigious, profound, pug-nosed, rachitic, rank, rattling, regrettable, repellent, reprehensible, reprobate, reptilian, repulsive, revolting, rickety, ridiculous, rococo, rotten, ruthless, sad, savage, scabby, scandalous, schlock, scrubby, scruffy, scummy, scurvy, shabby, shameful, shameless, shapeless