earthshaking

[urth-shey-king]

adjective

imperiling, challenging, or affecting basic beliefs, attitudes, relationships, etc.

Origin of earthshaking

1350–1400; Middle English. See earth, shaking
Related formsearth·shak·er, noun
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British Dictionary definitions for earthshaking

earthshaking

adjective

informal of enormous importance or consequence; momentous
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012