Illogical
Illogical adjective - Not using or following good reasoning.
Usage example: illogical people are likely to believe every sensational claim made on TV
Unsound is a synonym for illogical in irrational topic. In some cases you can use "Unsound" instead an adjective "Illogical", when it comes to topics like correct, not making sense. popular alternative
Nearby Word: illogicality
Unsound
Unsound adjective - Not using or following good reasoning.
Usage example: it is clearly unsound to argue that just because a scientific explanation for that phenomenon does not currently exist, no such explanation is possible
Illogical is a synonym for unsound in correct topic. You can use "Illogical" instead an adjective "Unsound", if it concerns topics such as flimsy, untenable. popular alternative
Mutual synonyms
Cite this Source
Unsound and Illogical. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/illogical/unsound
Illogical & Unsound. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/illogical/unsound>.
Unsound or Illogical. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/illogical/unsound.
Google Ngram Viewer shows how "illogical" and "unsound" have occurred on timeline