Formidable
Formidable adjective - Causing fear.
Nightmare and formidable are semantically related. In some cases you can use "Nightmare" instead an adjective "Formidable".
Nearby Word: formidably
Nightmare
Nightmare adjective - Extremely disturbing or repellent.
Usage example: survivors of a nuclear holocaust would surely face a nightmare existence
Formidable and nightmare are semantically related. Sometimes you can use "Formidable" instead an adjective "Nightmare".
Nearby Word: nightmarish
Mutual synonyms
Both words in one sentence
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From Nobody to Nightmare: The Tyrannosaurus, Triceratops, and Dakotaraptor all start out as adorable hatchlings, before each growing up to be quite formidable.
Source: Video Game / Saurian
Cite this Source
Nightmare and Formidable. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/formidable/nightmare
Formidable & Nightmare. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/formidable/nightmare>.
Nightmare or Formidable. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/formidable/nightmare.
Google Ngram Viewer shows how "formidable" and "nightmare" have occurred on timeline