earthshaking

[urth-shey-king]
adjective
imperiling, challenging, or affecting basic beliefs, attitudes, relationships, etc.

Origin:
1350–1400; Middle English. See earth, shaking

earthshaker, noun
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World English Dictionary
earthshaking (ˈɜːθˌʃeɪkɪŋ)
 
adj
informal of enormous importance or consequence; momentous

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The drone technology is impressive, but hardly earthshaking in its level of
  innovation.
It's extraordinary to see such earthshaking news buried in an obscure band's
  press release.
It was an interesting discovery, although not earthshaking.
It will never be thought earthshaking or innovative, but it has something
  worthwhile to say and does so with an honest competency.
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