Challenging
Challenging adjective - Requiring considerable physical or mental effort.
Usage example: an exceptionally challenging brainteaser
Simple is an antonym for challenging.
Simple
Both words in one sentence
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Although the playfield has some moderately challenging shots, the extremely simple rules and basic layout quickly bored most players.
Source: Pinball / Vacation America -
Nintendo Hard: Despite the simple premise making use of four buttons, the combo system can get pretty frantic and challenging, more so in the second Silver and Gold tracks.
Source: Video Game / Vib-Ribbon -
Your character can't just move anywhere; to push a block, he has to have a route to the square behind it.Suddenly a task that seems so simple becomes really challenging.
Source: Video Game / Sokoban
Cite this Source
Simple and Challenging. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/challenging/simple
Challenging & Simple. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/challenging/simple>.
Simple or Challenging. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/challenging/simple.
Google Ngram Viewer shows how "challenging" and "simple" have occurred on timeline