Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Resembling a nightmare.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Terrifying, as if in a nightmare{2}; resembling a nightmare{2}.

from The Century Dictionary and Cyclopedia

  • Like a nightmare.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. extremely alarming

Etymologies

nightmare +‎ -ish (Wiktionary)

Examples

Comments

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  • "Clearly today was going to be nightmarish." -Twilight, Stephanie Meyer, pg. 54

    October 27, 2010