Definitions
1.NounThe day when God is expected to judge the world; the end times.
2.NounJudgement day; the day of the Final Judgment; any day of decisive judgement or final dissolution.
3.NounAny day of great death and destruction; end of the world; an apocalypse.
4.NounAny of the memorable dates used in the doomsday rule for computing weekdays from dates.
5.AdjectiveConcerned with or predicting future universal destruction.
6.AdjectiveGiven to or marked by forebodings or predictions of impending calamity.
7.AdjectiveCapable of causing widespread or total destruction.