Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Contradicting or disregarding the principles of logic.
  • adj. Without logic; senseless.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Contrary to logic; lacking sense or sound reasoning.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Ignorant or negligent of the rules of logic or correct reasoning; ; contrary of the rules of logic or sound reasoning.

from The Century Dictionary and Cyclopedia

  • Ignorant or negligent of the rules of logic or sound reasoning: as, an illogical disputant.
  • Contrary to the rules of logic or sound reasoning: as, an illogical inference.
  • Synonyms Inconclusive, inconsequent, unsound, fallacious, sophistical.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. lacking orderly continuity
  • adj. lacking in correct logical relation

Etymologies

il- +‎ logical (Wiktionary)

Examples

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