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- Dictionaryirrational/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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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)
: lacking usual or normal mental clarity or coherence. (2) : not endowed with reason or understanding. b. : not governed by or according to reason. irrational fears. c Greek and Latin prosody. (1) of a syllable : having a quantity other than that required by the meter. (2) of a foot : containing such a syllable. d (1) : being an irrational number.
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.
If you describe someone's feelings and behaviour as irrational, you mean they are not based on logical reasons or clear thinking. ...an irrational fear of science.
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.
Definition of irrational adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
1. lacking the faculty of reason; deprived of reason. 2. lacking sound judgment or logic: irrational arguments. 3. not controlled or governed by reason: irrational behavior. 4. a. (of a number) not capable of being expressed exactly as a ratio of two integers.
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.
irrational meaning, definition, what is irrational: not based on clear thought or reason: Learn more.
Jun 2, 2024 · ( mathematics, arithmetic, number theory, not comparable) Of a real number, that cannot be written as the ratio of two integers . The number π is irrational. Antonym: rational. Hyponyms: transcendental, uncomputable. Derived terms. [ edit] irrationality. irrationalization.
