illogic

Etymology
From, after.

Noun

 * 1) Lack of logic; unreasonableness; a fallacy.
 * 2) * 1907, Jack London, Before Adam:
 * 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.