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worst-case

[wurst-keys]
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adjective
  1. of the worst possibility; being the worst result that could be expected under the circumstances: a worst-case scenario.
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Origin of worst-case

First recorded in 1960–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for worst case

worst case

noun
    1. a situation in which the most unfavourable conditions prevail
    2. (as modifier)a worst-case projection of a massive accident
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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