ETYM Old Eng. folie, foli, French folie, from fol, fou, foolish, mad. Related to Fool.
1. Foolish or senseless behavior; SYN. foolery, tomfoolery, indulgence.
2. The quality of being rash and foolish; SYN. foolishness, craziness.
3. The trait of acting stupidly or rashly; SYN. foolishness, unwiseness.