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monumental 
1 awe-inspiring, awesome, classic, enduring, enormous, epoch-making, historic, immortal, important, lasting, majestic, memorable, outstanding, prodigious, significant, stupendous, unforgettable 
2 commemorative, cyclopean, funerary, memorial, monolithic, statuary 
3  (informal) catastrophic, colossal, egregious, gigantic, great, horrible, immense, indefensible, massive, staggering, terrible, tremendous, unforgivable, whopping  (informal) 
1 ephemeral, inconsequential, insignificant, modest, negligible, ordinary, trivial, undistinguished, unimportant, unimpressive, unremarkable 
3 average, insignificant, mild, petty, slight, small, tiny, trivial