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We found 21 dictionaries with English definitions that include the word nightmarish:
Click on the first link on a line below to go directly to a page where "nightmarish" is defined.

General dictionaries General (19 matching dictionaries)
  1. nightmarish: Merriam-Webster.com [home, info]
  2. nightmarish: Oxford Learner's Dictionaries [home, info]
  3. nightmarish: Collins English Dictionary [home, info]
  4. nightmarish: Vocabulary.com [home, info]
  5. nightmarish: Macmillan Dictionary [home, info]
  6. Nightmarish, nightmarish: Wordnik [home, info]
  7. nightmarish: Cambridge Advanced Learner's Dictionary [home, info]
  8. nightmarish: Wiktionary [home, info]
  9. nightmarish: Infoplease Dictionary [home, info]
  10. nightmarish: Dictionary.com [home, info]
  11. nightmarish: Cambridge Dictionary of American English [home, info]
  12. nightmarish: Rhymezone [home, info]
  13. nightmarish: Free Dictionary [home, info]
  14. nightmarish: Mnemonic Dictionary [home, info]
  15. nightmarish: WordNet 1.7 Vocabulary Helper [home, info]
  16. nightmarish: LookWAYup Translating Dictionary/Thesaurus [home, info]
  17. nightmarish: Dictionary/thesaurus [home, info]

Medicine dictionaries Medicine (1 matching dictionary)
  1. nightmarish: Medical dictionary [home, info]

Slang dictionaries Slang (1 matching dictionary)
  1. nightmarish: Urban Dictionary [home, info]

(Note: See nightmarishly for more definitions.)

Quick definitions from Macmillan (
American English Definition British English Definition

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Quick definitions from WordNet (nightmarish)

adjective:  extremely alarming

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Words similar to nightmarish:   bloodcurdling, hair-raising, nightmare, more...

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