imperiling, challenging, or affecting basic beliefs, attitudes, relationships, etc.
Origin of earthshaking
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Related Words for earthshakingnotable, crucial, far-reaching, historic, fateful, significant, memorable, consequential, pivotal, eventful, meaningful, decisive, weighty, critical, determining, essential, imperative, important, indispensable, paramount
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