Arduous and Rigorous

Arduous

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Arduous adjective – Requiring considerable physical or mental effort.
Usage example: climbing Mount Everest is an arduous, exhausting challenge

Rigorous is a synonym for arduous in difficult topic. In some cases you can use "Rigorous" instead an adjective "Arduous", when it comes to topics like heavy.
Nearby Word: arduously
Synonyms for Arduous

Rigorous

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Rigorous adjective – Requiring considerable physical or mental effort.
Usage example: studied for umpteen months for the rigorous exam

Arduous is a synonym for rigorous in heavy topic. You can use "Arduous" instead an adjective "Rigorous".
Nearby Words: rigorously, rigor, rigour, rigorism
Synonyms for Rigorous

Things that words describes

need arduous need rigorous need
process arduous process rigorous process
training arduous training rigorous training
level arduous level rigorous level
Other nouns: schedule, exam, standards, trials.
Cite this Source
Rigorous and Arduous. (2016). Retrieved 2021, August 02, from https://thesaurus.plus/related/arduous/rigorous
Arduous & Rigorous. N.p., 2016. Web. 02 Aug. 2021. <https://thesaurus.plus/related/arduous/rigorous>.
Rigorous or Arduous. 2016. Accessed August 02, 2021. https://thesaurus.plus/related/arduous/rigorous.

Synonyms for arduous
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Synonyms for rigorous
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Google Ngram Viewer shows how "arduous" and "rigorous" have occurred on timeline: