- the day of the Last Judgment, at the end of the world.
- any day of judgment or sentence.
- nuclear destruction of the world.
- given to or marked by forebodings or predictions of impending calamity; especially concerned with or predicting future universal destruction: the doomsday issue of all-out nuclear war.
- capable of causing widespread or total destruction: doomsday weapons.
- the day on which the Last Judgment will occur
- any day of reckoning
- characterized by predictions of disaster
