Difficultness
Difficultness noun - The quality of being difficult.
Rigorousness and difficultness are semantically related. In some cases you can replace term "Rigorousness" with "Difficultness", this nouns are similar.
Rigorousness
Rigorousness noun - Something hard to endure.
Difficultness and rigorousness are semantically related. Sometimes you can use "Difficultness" instead a noun "Rigorousness".
Mutual synonyms
Cite this Source
Rigorousness and Difficultness. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/difficultness/rigorousness
Difficultness & Rigorousness. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/difficultness/rigorousness>.
Rigorousness or Difficultness. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/difficultness/rigorousness.
Google Ngram Viewer shows how "difficultness" and "rigorousness" have occurred on timeline