Difficultly
Rigorously and difficultly are semantically related. in hard topic. In some cases you can use "Rigorously" instead an adverb "Difficultly".
Rigorously
Rigorously adverb - In a rigorous manner.
Difficultly and rigorously are semantically related. Sometimes you can replace term "Difficultly" with "Rigorously", this adverbs are similar.
Mutual synonyms
Cite this Source
Rigorously and Difficultly. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/difficultly/rigorously
Difficultly & Rigorously. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/difficultly/rigorously>.
Rigorously or Difficultly. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/difficultly/rigorously.
Google Ngram Viewer shows how "difficultly" and "rigorously" have occurred on timeline