Synonyms for Craziness (same or very similar meaning)
WordNet sense 1 (informal terms for insanity):
daftness, flakinessWordNet sense 2 (the quality of being rash and foolish):
folly, foolishness, madnessWordNet sense 3 (foolish or senseless behavior):
foolery, indulgence, lunacy, tomfooleryFrom the ODE community, based on WordNetadd/edit