LUNACY

n. 1 madness, insanity, dementia, craziness, derangement, psychosis, mania Formerly, it was believed that lunacy fluctuated in accordance with the phases of the moon 2 folly, foolishness, bad or poor judgement, illogicality, illogic, senselessness, ridiculousness, irrationality, foolhardiness, stupidity It would be sheer lunacy to confess to something you did not do