Irrational and Serious

Opposite meaning words

Irrational adjective - Not using or following good reasoning.

Show all Definitions

Serious is an antonym for irrational in illogical topic.

Serious adjective - Not joking or playful in mood or manner.

Show all Definitions

Irrational is an antonym for serious.

Nearby Words: seriously, seriousness

Cite this Source

Serious and Irrational. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/irrational/serious

Irrational & Serious. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/irrational/serious>.

Serious or Irrational. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/irrational/serious.

Google Ngram Viewer shows how "irrational" and "serious" have occurred on timeline