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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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Learn the meaning of irrational as an adjective and a noun, with synonyms, examples, and word history. Find out how irrational can describe a number, a being, a fear, or a decision.
Irrational means not using reason or clear thinking, or not based on logic. Learn how to pronounce it and see examples and translations in different languages.
Irrational definition: without the faculty of reason; deprived of reason.. See examples of IRRATIONAL used in a sentence.
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.
If you describe someone's feelings and behaviour as irrational, you mean they are not based on logical reasons or clear thinking.
not using reason or clear thinking: It's totally irrational, but I'm frightened of mice. His parents were worried by his increasingly irrational behavior. (Definition of irrational from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Irrational means not consistent with or using reason, or not expressible as a ratio of integers. Learn the synonyms, antonyms, and usage of irrational in mathematics, poetry, and psychology.
