Invalid
Invalid adjective - Not using or following good reasoning.
Usage example: an argument which has one untrue premise is invalid
Illegitimate is a synonym for invalid. In some cases you can use "Illegitimate" instead an adjective "Invalid".
Illegitimate
Illegitimate adjective - Not using or following good reasoning.
Usage example: made several illegitimate inferences
Invalid is a synonym for illegitimate in incorrect topic. You can use "Invalid" instead an adjective "Illegitimate", if it concerns topics such as not legal.
Nearby Words: illegitimacy, illegitimately
Mutual synonyms
Related pairs
- improper and invalid
- improper and illegitimate
- wrong and invalid
- wrong and illegitimate
- false and invalid
- false and illegitimate
- irrational and invalid
- irrational and illegitimate
- illegal and invalid
- illegal and illegitimate
- spurious and invalid
- spurious and illegitimate
- illogical and invalid
- illogical and illegitimate
Cite this Source
Illegitimate and Invalid. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/invalid/illegitimate
Invalid & Illegitimate. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/invalid/illegitimate>.
Illegitimate or Invalid. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/invalid/illegitimate.
Google Ngram Viewer shows how "invalid" and "illegitimate" have occurred on timeline