The meaning of IRRATIONAL is not rational. How to use irrational in a sentence.

IRRATIONAL definition: 1. not using reason or clear thinking: 2. (of a number) that cannot be expressed as the ratio of…. Learn more.

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

irrational (ɪˈræʃənəl) adj 1. inconsistent with reason or logic; illogical; absurd 2. incapable of reasoning

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.

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

Sep 22, 2025 · irrational (comparative more irrational, superlative most irrational) Not rational; unfounded, nonsensical or wrong-headed. quotations an irrational decision

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

not having the power of reason: Brute animals are irrational beings. Mathematics (of a number) that cannot be expressed exactly as a ratio of two integers: The value of pi is an irrational …

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 …