Serious
Serious adjective - Not joking or playful in mood or manner.
Viperous and serious are semantically related. In some cases you can use "Viperous" instead an adjective "Serious".
Nearby Words: seriously, seriousness
Mutual synonyms
Cite this Source
Viperous and Serious. (2016). Retrieved 2026, July 27, from https://thesaurus.plus/related/serious/viperous
Serious & Viperous. N.p., 2016. Web. 27 Jul. 2026. <https://thesaurus.plus/related/serious/viperous>.
Viperous or Serious. 2016. Accessed July 27, 2026. https://thesaurus.plus/related/serious/viperous.
Google Ngram Viewer shows how "serious" and "viperous" have occurred on timeline