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  1. Dictionary
    irrational
    /ɪˈraʃən(ə)l/

    adjective

    • 1. not logical or reasonable: "irrational feelings of hostility"
    • 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.

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

    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.

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

    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…

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

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

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

    Irrational definition: without the faculty of reason; deprived of reason.. See examples of IRRATIONAL used in a sentence.

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

    Usually you use irrational to describe ideas and thoughts that are not based on reason, although emotions and behavior can be irrational too if they don't seem reasonable. Do you jump onto a chair and scream when you see a mouse? If so, you have an irrational fear of mice, or musophobia.

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

    adj. 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.

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

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

  9. dictionary.cambridge.org › dictionary › learner-englishMeaning of irrational – Learner’s Dictionary - Cambridge...

    irrational. adjective. 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.

  10. www.ldoceonline.com › dictionary › irrationalirrational | meaning of irrational in Longman Dictionary of ...

    irrational meaning, definition, what is irrational: not based on clear thought or reason: Learn more.

  11. www.collinsdictionary.com › us › dictionaryAll resources related to 'irrational' - Collins Online Dictionary

    Definitions of 'irrational' If you describe someone's feelings and behavior as irrational , you mean they are not based on logical reasons or clear thinking. More