Invalid
Invalid adjective - Not using or following good reasoning.
Usage example: an argument which has one untrue premise is invalid
Irrational is a synonym for invalid in illogical topic. In some cases you can use "Irrational" instead an adjective "Invalid", when it comes to topics like worthless, unfounded.
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
Invalid is a synonym for irrational in illogical topic. You can use "Invalid" instead an adjective "Irrational".
Nearby Words: irrationality, irrationally
Mutual synonyms
Related pairs
- wrong and invalid
- wrong and irrational
- inconsistent and invalid
- inconsistent and irrational
- implausible and invalid
- implausible and irrational
- illogical and invalid
- illogical and irrational
- unsound and invalid
- unsound and irrational
- senseless and invalid
- senseless and irrational
- absurd and invalid
- absurd and irrational
Cite this Source
Irrational and Invalid. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/invalid/irrational
Invalid & Irrational. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/invalid/irrational>.
Irrational or Invalid. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/invalid/irrational.
Google Ngram Viewer shows how "invalid" and "irrational" have occurred on timeline