1. (

• craziness ,
• daftness ,
• flakiness

) informal terms for insanity ;

2. (

• folly ,
• foolishness ,
• craziness ,
• madness

) the quality of being rash and foolish; "trying to drive through a blizzard is the height of folly"; "adjusting to an insane society is total foolishness" ;

3. (

• folly ,
• foolery ,
• tomfoolery ,
• craziness ,
• lunacy ,
• indulgence ,

) foolish or senseless behavior ;