Irrational and Unreasonable

Similar meaning words

Irrational adjective - Not using or following good reasoning.

Usage example: it's irrational to think that you can continue to consume an excess of calories and not gain weight

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Unreasonable is a synonym for irrational in illogical topic. In some cases you can use "Unreasonable" instead an adjective "Irrational", when it comes to topics like behaviour, reason, impetuous, blind. popular alternative

Unreasonable adjective - Having no basis in reason or fact.

Usage example: an unreasonable assumption

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Irrational is a synonym for unreasonable in behaviour topic. You can use "Irrational" instead the word "Unreasonable" as an adjective or a noun, if it concerns topics such as reason, impetuous, illogical, absurd. popular alternative

The mages' primary advocate, Anders, is portrayed as someone who demonizes the Templars and is irrational and unreasonable due to being possessed by the spirit of Justice.

Source: Demonization
Moral Myopia: Twilight uses the events of Lesson Zero and A Canterlot Wedding as evidence that she can't trust her friends with her secret, conveniently ignoring how irrational and unreasonable she was in both episodes.

Source: Blog / Twilight Unbound
Wounded Gazelle Gambit: Both Lila and Dexter use this tactic in season 2, Lila to gain sympathy from Dexter, Dexter to make it look as if Doakes simply has an unreasonable and irrational hatred of him.

Source: Series / Dexter

Cite this Source

Unreasonable and Irrational. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/irrational/unreasonable

Irrational & Unreasonable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/irrational/unreasonable>.

Unreasonable or Irrational. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/irrational/unreasonable.

Google Ngram Viewer shows how "irrational" and "unreasonable" have occurred on timeline