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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
First recorded in 1580-90; il-2 + logical
Related forms
illogically, adverb
illogicalness, noun
unsound, absurd, preposterous. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for illogical
Contemporary Examples
Historical Examples
  • From it, a thousand wild, illogical, and fantastic conclusions are drawn.

    The Story of the Malakand Field Force Sir Winston S. Churchill
  • This is possible, it is not illogical, and Berkeley believes it.

  • He was only misled by his love of antithesis into a hasty and illogical remark.

    Wilfrid Cumbermede George MacDonald
  • Plato saw the necessity of combating the illogical logic of the Megarians and Eristics.

    Theaetetus Plato
  • That, of course, was illogical; but you can hardly expect logic from a man in his position.

    Captain Blood Rafael Sabatini
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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