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nightmarish

[nahyt-mair-ish]
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adjective
  1. resembling a nightmare, especially in being terrifying, exasperating, or the like: his nightmarish experience in a concentration camp.
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Origin of nightmarish

First recorded in 1825–35; nightmare + -ish1
Related formsnight·mar·ish·ly, adverbnight·mar·ish·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for nightmarish

adj.

1834, from nightmare + -ish. Related: Nightmarishly; nightmarishness.

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Online Etymology Dictionary, © 2010 Douglas Harper