Insincere
Insincere adjective - Not being or expressing what one appears to be or express.
Unserious and insincere are semantically related. In some cases you can use "Unserious" instead an adjective "Insincere".
Nearby Words: insincerity, insincerely
Unserious
Mutual synonyms
Cite this Source
Unserious and Insincere. (2016). Retrieved 2026, July 28, from https://thesaurus.plus/related/insincere/unserious
Insincere & Unserious. N.p., 2016. Web. 28 Jul. 2026. <https://thesaurus.plus/related/insincere/unserious>.
Unserious or Insincere. 2016. Accessed July 28, 2026. https://thesaurus.plus/related/insincere/unserious.
Google Ngram Viewer shows how "insincere" and "unserious" have occurred on timeline