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
Onerous and hellacious are semantically related. In some cases you can use "Onerous" instead an adjective "Hellacious".
Onerous
Onerous adjective - Difficult to endure.
Hellacious and onerous are semantically related. Sometimes you can use "Hellacious" instead an adjective "Onerous".
Nearby Word: onerously
Mutual synonyms
Related pairs
Cite this Source
Onerous and Hellacious. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/hellacious/onerous
Hellacious & Onerous. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/hellacious/onerous>.
Onerous or Hellacious. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/hellacious/onerous.
Google Ngram Viewer shows how "hellacious" and "onerous" have occurred on timeline