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1. Dictionary

   irrational

   /ɪˈraʃən(ə)l/

   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 non-recurring 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 or quantity; a surd.

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

   Scrabble Points: 10

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2. www.merriam-webster.com › dictionary › irrationalIrrational Definition & Meaning - Merriam-Webster

   www.merriam-webster.com › dictionary › irrational

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   The meaning of IRRATIONAL is not rational. How to use irrational in a sentence. not rational: such as; lacking usual or normal mental clarity or coherence; not endowed with reason or understanding…

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

   dictionary.cambridge.org › dictionary › english

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   uk / ɪˈræʃ. ə n. ə l / us / ɪˈræʃ. ə n. ə l / Add to word list. C2. not using reason or clear thinking: It's totally irrational, but I'm frightened of mice. His parents were worried by his increasingly irrational behaviour. (Definition of irrational from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

4. www.dictionary.com › browse › irrationalIRRATIONAL Definition & Meaning | Dictionary.com

   www.dictionary.com › browse › irrational

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   adjective. without the faculty of reason; deprived of reason. without or deprived of normal mental clarity or sound judgment. not in accordance with reason; utterly illogical: irrational arguments. Synonyms: insensate, ridiculous, unreasonable. not endowed with the faculty of reason: irrational animals. Mathematics.

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

   www.collinsdictionary.com › dictionary › english

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   Jun 15, 2024 · If you describe someone's feelings and behaviour as irrational, you mean they are not based on logical reasons or clear thinking.

6. www.vocabulary.com › dictionary › irrationalIrrational - Definition, Meaning & Synonyms | Vocabulary.com

   www.vocabulary.com › dictionary › irrational

   noun. a real number that cannot be expressed as a rational number. synonyms: irrational number.

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

   www.thefreedictionary.com › irrational

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   adj. 1. a. Not endowed with reason. b. Affected by loss of usual or normal mental clarity; incoherent, as from shock. c. Marked by a lack of accord with reason or sound judgment: an irrational dislike. 2. a. Being a syllable in Greek and Latin prosody whose length does not fit the metric pattern. b. Being a metric foot containing such a syllable.

8. www.oxfordlearnersdictionaries.com › english › irrationalirrational adjective - Definition, pictures, pronunciation and...

   www.oxfordlearnersdictionaries.com › english › irrational

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   Definition of irrational adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.