Illogical
Illogical adjective - Not using or following good reasoning.
Usage example: illogical people are likely to believe every sensational claim made on TV
Illegitimate is a synonym for illogical. In some cases you can use "Illegitimate" instead an adjective "Illogical".
Nearby Word: illogicality
Illegitimate
Illegitimate adjective - Not using or following good reasoning.
Usage example: made several illegitimate inferences
Illogical is a synonym for illegitimate in invalid topic. You can use "Illogical" instead an adjective "Illegitimate", if it concerns topics such as incorrect.
Nearby Words: illegitimacy, illegitimately
Mutual synonyms
Cite this Source
Illegitimate and Illogical. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/illogical/illegitimate
Illogical & Illegitimate. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/illogical/illegitimate>.
Illegitimate or Illogical. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/illogical/illegitimate.
Google Ngram Viewer shows how "illogical" and "illegitimate" have occurred on timeline