n. 25B6; noun
originality demands a degree of lunacy : INSANITY, madness, mental illness, dementia, mania, psychosis; informal craziness.
the lunacy of gambling : FOLLY, foolishness, foolhardiness, stupidity, silliness, idiocy, madness, rashness, recklessness, imprudence, irresponsibility, injudiciousness; informal craziness; Brit. informal daftness.
sanity, sense, prudence.