Home › Words › I › illogicillogic/ɪˈlɑd͡ʒɪk/illogic means synonym of illogical.illogic is pronounced /ɪˈlɑd͡ʒɪk/.EtymologyFrom il- + logic, after illogical.adjSynonym of illogical.e.g.“I think this is a very illogic way of reasoning.” — 1896, JAMA: The Journal of the American Medical Association:nounLack of logic; unreasonableness; a fallacy.e.g.“And right often have I, the modern, been perturbed and vexed by the foolishness, illogic, obtuseness, and general all-round stupendous stupidity of myself, the primitive.” — 1907, Jack London, Before AdamDefinitions & examples from Wiktionary (CC BY-SA 3.0).