folly

Noun

• foolish or senseless behavior

• 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
    

• a stupid mistake

• the trait of acting stupidly or rashly

Related words

• Synonyms: 
  foolery , tomfoolery , craziness , lunacy , indulgence , foolishness , madness , stupidity , betise , imbecility , unwiseness
• Antonyms: 
  wisdom , wiseness