- 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 of illogical; from in- + logical
- Contradicting or disregarding the principles of logic.
- Without logic; senseless.
- il·log′i·cal′i·ty , il·log′i·cal·ness
(comparative more illogical, superlative most illogical)