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

   www.collinsdictionary.com › dictionary › english

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   6 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.

4. 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.

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

   www.oxfordlearnersdictionaries.com › definition › english

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   adjective. /ɪˈræʃənl/ not based on, or not using, clear logical thought synonym unreasonable. an irrational fear. You're being irrational. opposite rational. Extra Examples. Oxford Collocations Dictionary. Word Origin. Questions about grammar and vocabulary?

6. dictionary.cambridge.org › dictionary › learner-englishIRRATIONAL | meaning - Cambridge Learner's Dictionary

   dictionary.cambridge.org › dictionary › learner-english

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   uk / ɪˈræʃ ə n ə l / us. Add to word list. Irrational feelings and actions are based on your emotions and not on good reasons: irrational behaviour. an irrational fear of flying. irrationality. noun [ U ] uk / ɪˌræʃ ə nˈæləti / us. irrationally. adverb. (Definition of irrational from the Cambridge Learner's Dictionary © Cambridge University Press)

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.merriam-webster.com › thesaurus › irrationalIRRATIONAL Synonyms: 89 Similar and Opposite Words - ...

   www.merriam-webster.com › thesaurus › irrational

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   Synonyms for IRRATIONAL: unreasonable, unreasoning, illegitimate, unreasoned, illogical, misleading, absurd, weak; Antonyms of IRRATIONAL: rational, reasonable, logical, valid, sound, sensible, wise, sane.