Unreason

1. (n.) Want of reason; unreasonableness; absurdity.

2. (v. t.) To undo, disprove, or refute by reasoning.

Thesaurus Entries

callowness, childishness, immaturity, imprudence, inadvisability, inattention, inconsideration, indiscreetness, indiscretion, inexpedience, injudiciousness, irrationality, pompousness, puerility, reasonlessness, recklessness, senselessness, stuffiness, thoughtlessness, unintelligence, unreasonableness, unsensibleness, unsoundness, unthoughtfulness, unwisdom, unwiseness, witlessness