Irrational and Valid
Opposite meaning words
Irrational
Irrational adjective - Not using or following good reasoning.
Usage example: it's irrational to think that you can continue to consume an excess of calories and not gain weight
Valid is an antonym for irrational.
Nearby Words: irrationality, irrationally
Valid
Valid adjective - According to the rules of logic.
Usage example: your argument isn't valid because you're taking what should be the conclusion and using it as a premise
Irrational is an antonym for valid.
Nearby Words: validity, validation
Cite this Source
Valid and Irrational. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/irrational/valid
Irrational & Valid. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/irrational/valid>.
Valid or Irrational. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/irrational/valid.
Google Ngram Viewer shows how "irrational" and "valid" have occurred on timeline