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irrational

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