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informal of enormous importance or consequence; momentous
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
imperiling, challenging, or significantly affecting basic beliefs, attitudes, relationships, etc.
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adjective (Informal) momentous, shocking, historic, decisive, pivotal, seismic, apocalyptic, fateful, epoch-making, earth-shaking the earth-shattering news of his death
Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002