Synonyms of 'earth-shattering'
the earth-shattering news of his death
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If a fact, action, or event is decisive, it makes it certain that there will be a particular result.
his decisive victory in the elections
What changed for him in that fateful year?
Something that is historic is important in history, or likely to be considered important at some time in the future.
the historic changes in Eastern Europe
Thesaurus for earth-shattering from the Collins English Thesaurus
Something that is earth-shattering is very surprising or shocking .