earth-shattering

all-important consequential critical crucial determining earth-shaking essential imperative important indispensable life-or-death meaningful of vital importance paramount pivotal serious significant urgent vital vitally important

consequential crucial decisive eventful far-reaching fateful historic meaningful memorable notable pivotal significant weighty

big chips are down considerable critical earth-shaking epochal grave heavy heavy number material of moment outstanding substantial vital

inconsequential insignificant meaningless ordinary trivial uneventful unimportant unnoteworthy unremarkable unsubstantial

immaterial trifling