doomsday

[ doomz-dey ]
/ ˈdumzˌdeɪ /

noun

the day of the Last Judgment, at the end of the world.
any day of judgment or sentence.
nuclear destruction of the world.

adjective

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.

Origin of doomsday

before 1000; Middle English domes dai, Old English dōmesdæg Judgment Day. See doom, day
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for doomsday

doomsday

domesday

/ (ˈduːmzˌdeɪ) /

noun

(sometimes capital) the day on which the Last Judgment will occur
any day of reckoning
(modifier) characterized by predictions of disasterdoomsday scenario

Word Origin for doomsday

Old English dōmes dæg Judgment Day; related to Old Norse domsdagr
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012