Diligent and Not serious
Opposite meaning terms
Diligent
Diligent adjective - Involved in often constant activity.
Not serious is an antonym for diligent.
Nearby Words: diligence, diligently
Not serious
Cite this Source
Not serious and Diligent. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/diligent/not_serious
Diligent & Not serious. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/diligent/not_serious>.
Not serious or Diligent. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/diligent/not_serious.
Google Ngram Viewer shows how "diligent" and "not serious" have occurred on timeline