Complex
Complex adjective - Having many parts or aspects that are usually interrelated.
Usage example: complex issues regarding free speech and school discipline
Simple
Simple adjective - Involving minimal difficulty or effort.
Usage example: I got all of the answers right because it was such a simple test
Complex is an antonym for simple in topics: uncomplicated, clear, childlike, feeble-minded, uncluttered.
Both words in one sentence
- As it turns out, there are reasons both simple and complex that it was Twilight Sparkle and no other pony who ended up on the quest for them.
Source: Amplifier Artifact - Stopping the Deus ex Machina can be simple or complex, and may deal with physical limitations or mental, emotional, or moral ones (even technically laudable ones, such as "refuses to take a life" — though in practice that's not such a good thing all the time).
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Similarly, Pastamastery is necessary to cook simple ramen dishes, even though lots of more complex cookings don't require any skills.
Source: Video Game / Kingdom of Loathing
Cite this Source
Simple and Complex. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/complex/simple
Complex & Simple. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/complex/simple>.
Simple or Complex. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/complex/simple.
Google Ngram Viewer shows how "complex" and "simple" have occurred on timeline