Formidable
Formidable adjective - Requiring considerable physical or mental effort.
Usage example: running a marathon is a formidable undertaking
Severe is a synonym for formidable in harsh topic. In some cases you can use "Severe" instead an adjective "Formidable", when it comes to topics like difficult, heavy, ambitious, hard.
Nearby Word: formidably
Mutual synonyms
Both words in one sentence
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Sadly, his severe emotional angst and horribly broken heart thanks to Seishirou take away from his true ass-kicking abilities; but when he's thinking straight, he's an extremely formidable opponent.
Source: Agent Peacock - Light started out as a formidable foe capable of taking on the Justice League single-handed, but was a victim of severe Villain Decay in the Bronze Age and Post-Crisis eras, mostly notable for being repeatedly defeated by kids.
Cite this Source
Severe and Formidable. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/formidable/severe
Formidable & Severe. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/formidable/severe>.
Severe or Formidable. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/formidable/severe.
Google Ngram Viewer shows how "formidable" and "severe" have occurred on timeline