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1. Dictionary

   Ir·ra·tion·al

   /i(r)ˈraSH(ə)nəl/

   

   adjective

   • 1. not logical or reasonable: "irrational feelings of hostility"
   • ▪ not endowed with the power of reason.
   • 2. (of a number, quantity, or expression) not expressible as a ratio of two integers, and having an infinite and nonrecurring expansion when expressed as a decimal. Examples of irrational numbers are the number π and the square root of 2.

   noun

   • 1. an irrational number.

   Word Origin late Middle English: from Latin irrationalis, from in- ‘not’ + rationalis (see rational).

   Scrabble Points: 10

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2. dictionary.cambridge.org › dictionary › englishIRRATIONAL | English meaning - Cambridge Dictionary

   dictionary.cambridge.org › dictionary › english

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   IRRATIONAL definition: 1. not using reason or clear thinking: 2. not using reason or clear thinking: 3. not based on…. Learn more.

3. www.thefreedictionary.com › irrationalIrrational - definition of irrational by The Free Dictionary

   www.thefreedictionary.com › irrational

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   1. inconsistent with reason or logic; illogical; absurd. 2. incapable of reasoning. 3. (Mathematics) maths. a. not rational. b. ( as noun ): an irrational. 4. (Poetry) prosody (in Greek or Latin verse) a. of or relating to a metrical irregularity, usually the occurrence of a long syllable instead of a short one.

4. www.collinsdictionary.com › dictionary › englishIRRATIONAL definition and meaning | Collins English Dictionary

   www.collinsdictionary.com › dictionary › english

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   4 days ago · 4 meanings: 1. inconsistent with reason or logic; illogical; absurd 2. incapable of reasoning 3. mathematics a. not rational b..... Click for more definitions.

5. www.collinsdictionary.com › us › dictionaryIRRATIONAL definition in American English | Collins English ...

   www.collinsdictionary.com › us › dictionary

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   Apr 18, 2024 · adjective. If you describe someone's feelings and behavior as irrational, you mean they are not based on logical reasons or clear thinking. ...an irrational fear of science. Synonyms: illogical, crazy [informal], silly, absurd More Synonyms of irrational. irrationally adverb. My husband is irrationally jealous over my past loves.

6. www.oxfordlearnersdictionaries.com › definition › englishirrational adjective - Definition, pictures, pronunciation ...

   www.oxfordlearnersdictionaries.com › definition › english

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   irrational. not based on, or not using, clear logical thought synonym unreasonable. You're being irrational. Definition of irrational adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

7. www.britannica.com › dictionary › irrationalIrrational Definition & Meaning | Britannica Dictionary

   www.britannica.com › dictionary › irrational

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   a : not thinking clearly : not able to use reason or good judgment. He became irrational as the fever got worse. b : not based on reason, good judgment, or clear thinking. She had an irrational fear of cats. an irrational prejudice. — irrationality. /ɪˌræʃə ˈnæləti/ noun [noncount] the irrationality of her fear. — irrationally. /ɪ ˈræʃənəli/ adverb

8. www.betterwordsonline.com › dictionary › irrationalIrrational - Definition, Meaning, Synonyms, Etymology

   www.betterwordsonline.com › dictionary › irrational

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   When something is described as irrational, it implies that it goes against the norms of rationality and cannot be justified or explained through logical thinking. Irrational behavior or decisions often stem from emotions, biases, or instinctual responses rather than objective reasoning.