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illogical

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The definition of illogical is not making sense or going against reason.

(adjective)

An example of something illogical is deciding to buy a $400,000 house because the price has recently been reduced, when the buyer can only realistically afford $200,000.

See illogical in Webster's New World College Dictionary

adjective

not logical or reasonable; using, based on, or caused by faulty reasoning

Origin: < in- + logical

Related Forms:

illogicality noun or illogicalness
illogically adverb

See illogical in American Heritage Dictionary 4

adjective

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

Related Forms:

il·logˌi·calˈi·ty (-kălˈĭ-tē), il·logˈi·cal·ness noun

il·logˈi·cal·ly adverb

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