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.

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.

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

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

Irrationality is cognition, thinking, talking, or acting without rationality.

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 …

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