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[ih-loj-i-kuh l] /ɪˈlɒdʒ ɪ kəl/
not logical; contrary to or disregardful of the rules of logic; unreasoning:
an illogical reply.
Origin of illogical
1580-90; il-2 + logical
Related forms
illogically, adverb
illogicalness, noun
unsound, absurd, preposterous. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for illogical
Contemporary Examples
Historical Examples
  • This is the meteorological or illogical rule, the "Summa Lex."

  • That is Nature's republicanism; thank God for it, but do not let it make you illogical.

    Elsie Venner Oliver Wendell Holmes, Sr.
  • Then indeed it will seem to be illogical, and it will be illogical, that love should be free when life has lost its freedom.

    Eugenics and Other Evils G. K. Chesterton
  • And even if he had had, the workings would have appeared to him illogical and unreasonable.

    Antony Gray,--Gardener Leslie Moore
  • I had a persuasion, illogical but invincible, that I was still entitled to all the respect due to a man of unblemished honor.

    The Passionate Friends Herbert George Wells
British Dictionary definitions for illogical


characterized by lack of logic; senseless or unreasonable
disregarding logical principles
Derived Forms
illogicality (ɪˌlɒdʒɪˈkælɪtɪ), illogicalness, noun
illogically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for illogical

1580s, from assimilated form of in- (1) "not, opposite of" + logical. Related: Illogically.

Online Etymology Dictionary, © 2010 Douglas Harper
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