Formidable
Formidable adjective - Requiring considerable physical or mental effort.
Usage example: running a marathon is a formidable undertaking
Rough is a synonym for formidable in difficult topic. In some cases you can use "Rough" instead an adjective "Formidable", when it comes to topics like heavy.
Nearby Word: formidably
Rough
Rough adjective - Requiring considerable physical or mental effort.
Usage example: a forensics expert who willingly takes on rough assignments
Formidable is a synonym for rough in heavy topic. Sometimes you can use "Formidable" instead an adjective "Rough".
Both words in one sentence
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Leave the stained tunics and rough cloaks to the commoners and their mud farmsa proper Orlesian climbs mountains in her evening gown, standing taller at the summit in her formidable high-heeled shoes.
Source: Action Fashionista - Serenity herself has been through many rough times, being a very old ship (but not as old as some that Book has traveled on in his day), and in fact had hit rock bottom when she joined Mal's crew, and proves to be one of the most formidable characters despite being completely unarmed.
Source: Analysis / Firefly
Cite this Source
Rough and Formidable. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/formidable/rough
Formidable & Rough. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/formidable/rough>.
Rough or Formidable. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/formidable/rough.
Google Ngram Viewer shows how "formidable" and "rough" have occurred on timeline