Answer: earthshattering

AnswerCrossword Clue
EARTHSHATTERINGAwfully bad
EARTHSHATTERINGLikely to change everything
EARTHSHATTERINGMomentous
EARTHSHATTERINGOf great importance
EARTHSHATTERINGMonumental
EARTHSHATTERINGOf global significance
EARTHSHATTERINGShocking, and then some
earthshatteringof great importance or consequence