What is another word for irrational?

Synonyms for irrational
ɪˈræʃ ə nlir·ra·tional

This thesaurus page is about all possible synonyms, equivalent, same meaning and similar words for the term irrational.


  1. irrationaladjective


English Synonyms and Antonyms

  1. irrational

    That is absurd which is contrary to the first principles of reasoning; as, that a part should be greater than the whole is absurd. A paradoxical statement appears at first thought contradictory or absurd, while it may be really true. Anything is irrational when clearly contrary to sound reason, foolish when contrary to practical good sense, silly when petty and contemptible in its folly, erroneous when containing error that vitiates the result, unreasonable when there seems a perverse bias or an intent to go wrong. Monstrous and preposterous refer to what is overwhelmingly absurd; as, "O monstrous! eleven buckram men grown out of two," Shakespeare 1 King Henry IV, act ii, sc. 4. The ridiculous or the nonsensical is worthy only to be laughed at. The lunatic's claim to be a king is ridiculous; the Mother Goose rimes are nonsensical. Compare INCONGRUOUS.

    absurd, anomalous, chimerical, erroneous, false, foolish, ill-advised, ill-considered, ill-judged, inconclusive, incorrect, infatuated, ludicrous, mistaken, monstrous, nonsensical, paradoxical, preposterous, ridiculous, senseless, stupid, unreasonable, wild

    certain, consistent, demonstrable, demonstrated, established, incontestable, incontrovertible, indisputable, indubitable, infallible, logical, rational, reasonable, sagacious, sensible, sound, substantial, true, undeniable, unquestionable, wise

Princeton's WordNet

  1. irrational number, irrationaladjective

    a real number that cannot be expressed as a rational number

    irrational number

    lucid, rational, intelligent, thinking(a), sane, demythologized, reasonable, demythologised, reasoning(a), logical, coherent

  2. irrationaladjective

    not consistent with or using reason

    "irrational fears"; "irrational animals"

    rational, coherent, reasonable, thinking(a), lucid, demythologized, demythologised, sane, intelligent, logical, reasoning(a)

  3. irrationaladjective

    real but not expressible as the quotient of two integers

    "irrational numbers"

    rational, sane, coherent, logical, lucid, reasonable, thinking(a), intelligent, demythologized, demythologised, reasoning(a)

Matched Categories

Dictionary of English Synonymes

  1. irrationaladjective

    brutish, brute, void of reason, without reason

  2. irrationaladjective

    absurd, unreasonable, preposterous, foolish, silly, unwise, injudicious, extravagant

PPDB, the paraphrase database

  1. List of paraphrases for "irrational":

    unreasonable, absurd, illogical, senseless, unreasonably, mindless, unsound

How to pronounce irrational?

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How to use irrational in a sentence?

  1. Plato:

    Just as it would be madness to settle on medical treatment for the body of a person by taking an opinion poll of the neighbors, so it is irrational to prescribe for the body politic by polling the opinions of the people at large.

  2. Darryl Genovesi:

    It’s irrational day-trading, nothing fundamental. Same as GameStop, Tootsie Roll, Virgin Galactic, etc.

  3. Frank Haun:

    You can't say: The German army is not buying anything, you're not allowed to export anything, but you have to keep jobs here. It's irrational.

  4. Anthony Fauci:

    You can understand that when people have been following a certain trend for a considerable period of time that it may take time for them to adjust, i would not say that's irrational. I would say that's understandable.

  5. Doctor Who:

    It may be irrational of me, but human beings are quite my favorite species.

Translations for irrational

From our Multilingual Translation Dictionary

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"irrational." Synonyms.com. STANDS4 LLC, 2022. Web. 18 Aug. 2022. <https://www.synonyms.com/synonym/irrational>.

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    Which of the following terms is not a synonym for "Tolerable"?
    • A. adequate
    • B. fair to middling
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