Challenging
Challenging adjective - Requiring considerable physical or mental effort.
Usage example: an exceptionally challenging brainteaser
Friendly is an antonym for challenging.
Friendly
Friendly adjective - Having or showing kindly feeling and sincere interest.
Challenging is an antonym for friendly.
Both words in one sentence
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Friendly Rivalry: Stephen and Derrick in Season 6, who keep ribbing and challenging each other but still having deep-seated respect for each other's abilities and being able to laugh things off.
Source: Series / MasterChef
Cite this Source
Friendly and Challenging. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/challenging/friendly
Challenging & Friendly. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/challenging/friendly>.
Friendly or Challenging. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/challenging/friendly.
Google Ngram Viewer shows how "challenging" and "friendly" have occurred on timeline