Not serious
Smart and not serious are semantically related. in tongue-in-cheek topic. In some cases you can use "Smart" instead an adjective phrase "Not serious", when it comes to topics like ironic and insincere.
Smart
Smart adjective - Being strikingly neat and trim in style or appearance.
Not serious and smart are semantically related. Sometimes you can use "Not serious" instead an adjective "Smart".
Cite this Source
Smart and Not serious. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/not_serious/smart
Not serious & Smart. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/not_serious/smart>.
Smart or Not serious. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/not_serious/smart.
Google Ngram Viewer shows how "not serious" and "smart" have occurred on timeline