earthshaking

Adjective
  1. Loud enough to shake the very earth (synset 301456404)
    similar to: loud - characterized by or producing sound of great volume or intensity
  2. Sufficiently significant to affect the whole world (synset 302169873)
    "earthshaking proposals"; "the contest was no world-shaking affair"; "the conversation...could hardly be called world-shattering"
    similar to: important, significant - important in effect or meaning
    same as: world-shaking, world-shattering

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