Rational
Rational adjective - According to the rules of logic.
Usage example: insisted there was a rational explanation for the strange creaking noises and that there were no such things as ghosts
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
Rational is a synonym for valid in well founded topic. Sometimes you can use "Rational" instead an adjective "Valid".
Nearby Words: validity, validation
Mutual synonyms
Both words in one sentence
- Star Warsthe Old Republic, this is a valid interpretation for a Sith Inquisitor, who is "differently rational" even under the best of circumstances.
Source: Crazy Sane -
If not for the one rational cop on the investigation (old cop, who is clearly In-Valid and yet superior thanks to years of experience), not only would they have failed to find the murderer, they wouldn't even have come close to finding Vincent.
Source: Film / Gattaca
Cite this Source
Valid and Rational. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/rational/valid
Rational & Valid. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/rational/valid>.
Valid or Rational. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/rational/valid.
Google Ngram Viewer shows how "rational" and "valid" have occurred on timeline