Foolish
Foolish adjective - Showing or marked by a lack of good sense or judgment.
Usage example: a foolish scheme that was supposed to make us all rich
Simple is a synonym for foolish in mental condition topic. In some cases you can use "Simple" instead an adjective "Foolish", when it comes to topics like silly, nonsensical.
Simple
Simple adjective - Lacking in education or the knowledge gained from books.
Usage example: the fact that he didn't go to college doesn't mean he's simple
Foolish is a synonym for simple in feeble-minded topic. Sometimes you can use "Foolish" instead an adjective "Simple", if it concerns topics such as characteristic, mental condition.
Mutual synonyms
Both words in one sentence
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It's not quite as simple - Sophie is more impulsive and passionate, but she is certainly not foolish.
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Many times, it works for them where a simple mustache would just look foolish or out of place.
Source: Badass Beard -
You're a hundred years too early to think you can treat me as a simple distraction or a foolish girl, you little punk.
Cite this Source
Simple and Foolish. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/foolish/simple
Foolish & Simple. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/foolish/simple>.
Simple or Foolish. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/foolish/simple.
Google Ngram Viewer shows how "foolish" and "simple" have occurred on timeline