Of, pertaining to, or suitable for, a monument; as, a monumental inscription. [1913 Webster]
Serving as a monument; memorial; preserving memory. Milton. [1913 Webster]
"A work outlasting monumental brass." [1913 Webster]
Of lasting significance; as, a monumental work of literature; a monumental accomplishment. [PJC]
Exceptionally large in quantity, quality, or degree; as, a monumental amount of work to be done [PJC]

top

OXFORD DICTIONARY

monumental, adj.
1 a extremely great; stupendous (a monumental achievement). b (of a literary work) massive and permanent.
2 of or serving as a monument.

Idiom

monumental mason a maker of tombstones etc.

Derivative

monumentality n. monumentally adv.

top

THESAURUS

monumental

Atlantean, Brobdingnagian, Cyclopean, Gargantuan, Herculean, Homeric, Olympian, abject, abysmal, aerial, airy, altitudinous, amplitudinous, ascending, aspiring, astronomic, astronomical, awe-inspiring, awesome, awful, boundless, bulky, calamitous, catastrophic, classic, colossal, commemorative, cosmic, cracking, dominating, egregious, elephantine, elevated, eminent, enduring, enormous, epic, ethereal, exalted, extensive, fantastic, galactic, giant, giantlike, gigantic, glorious, grand, haughty, heroic, high, high-pitched, high-reaching, high-set, high-up, historic, huge, immeasurable, immense, impressive, infinite, jumbo, king-size, large, lasting, lofty, magnificent, mammoth, marmoreal, massive, massy, memorable, memorial, mighty, monster, monstrous, mortal, mountainous, mounting, notable, noteworthy, outsize, outstanding, outtopping, overgrown, overlooking, overtopping, overwhelming, permanent, prodigious, profound, prominent, sculptitory, sculptural, sculpturesque, significant, sizable, soaring, spacious, spectacular, spiring, staggering, statuary, statuelike, statuesque, steep, striking, stupendous, sublime, superlative, supernal, terrible, titanic, topless, toplofty, topping, towering, towery, tremendous, unbelievable, unforgettable, unforgivable, uplifted, upreared, vast, voluminous, weighty, whopping, wonderful, wondrous

top

ROGET THESAURUS

monumental

Size

N size, magnitude, dimension, bulk, volume, largeness, greatness, expanse, amplitude, mass, proportions, capacity, tonnage, tunnage, cordage, caliber, scantling, turgidity, corpulence, obesity, plumpness, embonpoint, corporation, flesh and blood, lustihood, hugeness, enormity, immensity, monstrosity, giant, Brobdingnagian, Antaeus, Goliath, Gog and Magog, Gargantua, monster, mammoth, Cyclops, cachalot, whale, porpoise, behemoth, leviathan, elephant, hippopotamus, colossus, tun, cord, lump, bulk, block, loaf, mass, swad, clod, nugget, bushel, thumper, whooper, spanker, strapper, Triton among the minnows, mountain, mound, heap, largest portion, full size, life size, large, big, great, considerable, bulky, voluminous, ample, massive, massy, capacious, comprehensive, spacious, mighty, towering, fine, magnificent, corpulent, stout, fat, obese, plump, squab, full, lusty, strapping, bouncing, portly, burly, well-fed, full-grown, corn fed, gram fed, stalwart, brawny, fleshy, goodly, in good case, in good condition, in condition, chopping, jolly, chub faced, chubby faced, lubberly, hulky, unwieldy, lumpish, gaunt, spanking, whacking, whopping, walloping, thumping, thundering, hulking, overgrown, puffy, huge, immense, enormous, mighty, vast, vasty, amplitudinous, stupendous, monster, monstrous, humongous, monumental, elephantine, jumbo, mammoth, gigantic, gigantean, giant, giant like, titanic, prodigious, colossal, Cyclopean, Brobdingnagian, Bunyanesque, Herculean, Gargantuan, infinite, large as life, plump as a dumpling, plump as a partridge, fat as a pig, fat as a quail, fat as butter, fat as brawn, fat as bacon, immeasurable, unfathomable, unplumbed, inconceivable, unimaginable, unheard-of, of cosmic proportions, of epic proportions, the mother of all, teh granddaddy of all.

For further exploring for "monumental" in Webster Dictionary Online