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Adjective irrational has 2 senses
- irrational - not consistent with or using reason; "irrational fears"; "irrational animals"
Antonyms: rational, coherent, logical, lucid, demythologized, demythologised, intelligent, reasoning, thinking, reasonable, sane
- irrational - real but not expressible as the quotient of two integers; "irrational numbers"
Antonym: rational
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