- The definition of illogical is not making sense or going against reason.
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.
Origin: from in- plush logical
Used by arrangement with John Wiley & Sons, Inc.
- Contradicting or disregarding the principles of logic.
- Without logic; senseless.
- il·logˌi·calˈi·ty , il·logˈi·cal·ness noun
- il·logˈi·cal·ly adverb