doomsday
adjective
°Concerned with or predicting future universal destruction; the doomsday issue of all-out nuclear war.
°Given to or marked by forebodings or predictions of impending calamity.
noun
°The day when God is expected to judge the world, at the end of the world; the Day of Judgement; the day of the Last Judgment.
°Any day of decisive judgement or final dissolution.
synonyms: apocalypse, armageddon, domesday, judgement day more» , ragnarok