Difficult
Difficult adjective - Requiring considerable physical or mental effort.
Nightmarish and difficult are semantically related. in bad topic. In some cases you can use "Nightmarish" instead an adjective "Difficult".
Nearby Word: difficulty
Nightmarish
Nightmarish adjective - Extremely disturbing or repellent.
Difficult and nightmarish are semantically related. Sometimes you can replace term "Difficult" with "Nightmarish", this adjectives are similar.
Nearby Word: nightmare
Cite this Source
Nightmarish and Difficult. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/difficult/nightmarish
Difficult & Nightmarish. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/difficult/nightmarish>.
Nightmarish or Difficult. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/difficult/nightmarish.
Google Ngram Viewer shows how "difficult" and "nightmarish" have occurred on timeline