Hellacious
Hellacious adjective - Requiring considerable physical or mental effort.
Usage example: the pioneers survived a particularly hellacious river crossing with their covered wagon barely in one piece
Rough and hellacious are semantically related. In some cases you can use "Rough" instead an adjective "Hellacious".
Rough
Rough adjective - Requiring considerable physical or mental effort.
Usage example: a forensics expert who willingly takes on rough assignments
Hellacious and rough are semantically related. Sometimes you can use "Hellacious" instead an adjective "Rough".
Cite this Source
Rough and Hellacious. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/hellacious/rough
Hellacious & Rough. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/hellacious/rough>.
Rough or Hellacious. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/hellacious/rough.
Google Ngram Viewer shows how "hellacious" and "rough" have occurred on timeline