Challenging
Challenging adjective - Requiring considerable physical or mental effort.
Usage example: an exceptionally challenging brainteaser
Testing and challenging are semantically related in demanding topic. In some cases you can use "Testing" instead an adjective "Challenging".
Testing
Testing adjective - Requiring considerable physical or mental effort.
Usage example: beginning rock climbers should choose a less testing route to the summit
Challenging and testing are semantically related in difficult topic. You can use "Challenging" instead an adjective "Testing".
Mutual synonyms
Related pairs
Both words in one sentence
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If someone is seriously testing or challenging you, they're "playing hardball." This usage is particularly common when talking about negotiations.
Source: Useful Notes / Baseball -
These movies played a huge role in loosening censorship and paving the way for other directors to start testing and challenging the Code.
Source: Creator / Otto Preminger
Cite this Source
Testing and Challenging. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/challenging/testing
Challenging & Testing. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/challenging/testing>.
Testing or Challenging. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/challenging/testing.
Google Ngram Viewer shows how "challenging" and "testing" have occurred on timeline