Hellacious
Hellacious adjective - Extreme in degree, power, or effect.
Usage example: the hellacious heat was more than we could bear
Keen and hellacious are semantically related. In some cases you can use "Keen" instead an adjective "Hellacious".
Keen
Keen adjective - Extreme in degree, power, or effect.
Usage example: movies gave him keen enjoyment like nothing else
Hellacious and keen are semantically related. Sometimes you can use "Hellacious" instead an adjective "Keen".
Cite this Source
Keen and Hellacious. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/hellacious/keen
Hellacious & Keen. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/hellacious/keen>.
Keen or Hellacious. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/hellacious/keen.
Google Ngram Viewer shows how "hellacious" and "keen" have occurred on timeline