Doomsday
WordNet
noun
(1) An unpleasant or disastrous destiny
"Everyone was aware of the approaching doom but was helpless to avoid it"
"That's unfortunate but it isn't the end of the world"
(2) (New Testament) day of the Last Judgment when God will decree the fates of all men according to the good and evil of their earthly lives
(3) (New Testament) day of the Last Judgment when God will decree the fates of all men according to the good and evil of their earthly lives