Illegitimate
Illegitimate adjective - Not using or following good reasoning.
Usage example: made several illegitimate inferences
Nonrational and illegitimate are semantically related. In some cases you can use "Nonrational" instead an adjective "Illegitimate".
Nearby Words: illegitimacy, illegitimately
Nonrational
Nonrational adjective - Not using or following good reasoning.
Usage example: was so upset that he was completely nonrational for a moment
Illegitimate and nonrational are semantically related. Sometimes you can use "Illegitimate" instead an adjective "Nonrational".
Mutual synonyms
Cite this Source
Nonrational and Illegitimate. (2016). Retrieved 2026, August 10, from https://thesaurus.plus/related/illegitimate/nonrational
Illegitimate & Nonrational. N.p., 2016. Web. 10 Aug. 2026. <https://thesaurus.plus/related/illegitimate/nonrational>.
Nonrational or Illegitimate. 2016. Accessed August 10, 2026. https://thesaurus.plus/related/illegitimate/nonrational.
Google Ngram Viewer shows how "illegitimate" and "nonrational" have occurred on timeline