Rational
Rational adjective - Having the ability to reason.
Usage example: human beings are rational creatures
Reasonable is a synonym for rational in sensible topic. In some cases you can use "Reasonable" instead an adjective "Rational", when it comes to topics like behaviour, mental condition, character trait, reason. popular alternative
Reasonable
Reasonable adjective - According to the rules of logic.
Usage example: his answer is perfectly reasonable
Rational is a synonym for reasonable in sensible topic. You can use "Rational" instead an adjective "Reasonable", if it concerns topics such as behaviour, mental condition, character trait, reason. popular alternative
Mutual synonyms
Related pairs
Cite this Source
Reasonable and Rational. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/rational/reasonable
Rational & Reasonable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/rational/reasonable>.
Reasonable or Rational. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/rational/reasonable.
Google Ngram Viewer shows how "rational" and "reasonable" have occurred on timeline