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Synonyms
big, consequential, earthshaking, eventful, historic, important, major, material, meaningful, momentous, monumental, much, significant, substantial, tectonic, weighty
Antonyms
inconsequential, inconsiderable, insignificant, little, minor, negligible, slight, small, trifling, trivial, unimportant
circa 1859, in the meaning defined above
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More from Merriam-Webster on earth-shattering
Rhyming Dictionary: Words that rhyme with earth-shattering
Thesaurus: All synonyms and antonyms for earth-shattering
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