Illegitimate
Illegitimate adjective - Not using or following good reasoning.
Usage example: made several illegitimate inferences
Valid is an antonym for illegitimate.
Nearby Words: illegitimacy, illegitimately
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
Nearby Words: validity, validation
Both words in one sentence
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Runaway Bride: Paul and Jamie discover (in Season 7 and post-illegitimate baby) that their wedding wasn't legally valid.
Source: Series / Mad About You
Cite this Source
Valid and Illegitimate. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/illegitimate/valid
Illegitimate & Valid. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/illegitimate/valid>.
Valid or Illegitimate. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/illegitimate/valid.
Google Ngram Viewer shows how "illegitimate" and "valid" have occurred on timeline