nightmare

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nightmare

informal Something that is quite annoying, challenging, or stressful. A: "So now I have to copy all this paperwork and organize it by five o'clock tonight." B: "Wow, good luck to you. That sounds like a nightmare." Our flight to Disney was an absolute nightmare—just screaming and crying kids left and right.

the worst-case scenario

The worst possible thing that could happen. We don't expect it to happen, but we need to plan for the worst-case scenario. The worst-case scenario here is that we lose the next three games and miss the playoffs. The best-case scenario is that we win out and get a bye in the first round.
See also: scenario
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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