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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.
1580-90; il-2 + logical
Related forms
illogically, adverb
illogicalness, noun
unsound, absurd, preposterous. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for illogical
  • Some of their proposed usages are internally illogical.
  • Even arguments for academic freedom, he said, risk straying into illogical territory.
  • Your illogical misadventures should highlight it for her nicely.
  • We need to stop brainwashing children to believe the illogical.
  • What some have pointed out is that his argument is illogical.
  • Although it has a certain fund of originality, it is spasmodically illogical and bewildering.
  • Ethnocentrism and cultural xenophobia are merely tools used by illogical people to sway public opinion to achieve political aims.
  • No conspiracy theories, no wacky illogical prejudices, nothing.
  • It's always been driven by illogical fear and panic.
  • Failing to recognize seniority should be consider morally deplorable and illogical.
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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