fol·ly 
/ˈfɑ:li/ noun
plural fol·lies /ˈfɑ:li/ noun 1 [noncount] a : the lack of good sense or judgment : foolishness
▪ the folly of driving fast on steep, winding roads ▪ his folly in thinking that he would not be noticed ▪ The folly of such an action should be apparent to everyone.
b : a foolish act or idea : foolish behavior [noncount] ▪ Their pranks were just youthful folly. [=the kinds of foolish things that young people often do] [count] ▪ engaging in youthful follies ▪ the follies of the modern world 2 [count] : a very unusual or fancy building that was built in a garden for decoration or amusement in the past 3 follies [plural] chiefly US : a large public show or entertainment with many performers
▪ the famous Ziegfeld Follies of the 1920s ▪ ice follies [=a show with ice-skaters skating to music]
▪ the folly of driving fast on steep, winding roads ▪ his folly in thinking that he would not be noticed ▪ The folly of such an action should be apparent to everyone.
b : a foolish act or idea : foolish behavior [noncount] ▪ Their pranks were just youthful folly. [=the kinds of foolish things that young people often do] [count] ▪ engaging in youthful follies ▪ the follies of the modern world
▪ the famous Ziegfeld Follies of the 1920s ▪ ice follies [=a show with ice-skaters skating to music]
