Synonyms of monumental

1 Syllable

huge, vast, grand, fab, great

2 Syllables

huger, grander, fabber, king-size, hugest, mondo, massy, mammoth, classic, whaling, lasting, vastest, massiest, lofty, vaster, spread-out, doozie, august, hulking, massier, whaler, mortal, well-done, grandest, mighty

3 Syllables

enduring, important, statelier, enormous, gigantic, immortal, prodigious, stupendous, imposing, majestic, pythonic, palatial, ginormous, magnific, grandiose, sizeable, memorials, fantastic, towering, gargantuan, stretched-out, titanic, immense, historic, stately, massive, outstanding, tremendous, towery, mountainous, humungous, cyclopean, walloping, leviathan, memorial

4 Syllables

impressive, awesome, astronomic, behemothic, significant, larger-than-life, memorable, awe-inspiring, super-duper, bunyanesque, gigantesque, mastodonic

5 Syllables

elephantine, high-falutin', dedicatory, celebrative, consecrative, unforgettable, highfalutin', astronomical

6 Syllables

commemoratory