fatuity

/fəˈtuːəti/
noun
  1. Foolishness or stupidity, especially when someone is unaware of how silly they are.
    • The movie's plot was criticized for its fatuity, with characters making obviously dumb choices.
    • She regretted her moment of fatuity when she sent the angry email without thinking.
    • The politician's speech was full of fatuity, making the audience laugh at his ridiculous claims.
  2. A foolish or silly act, remark, or idea.
    • I can't believe I listened to that fatuity about investing in magic beans.
    • His plan to build a bridge out of cardboard was just another fatuity.
    • The book is filled with the fatuities of a young man who thinks he knows everything.
Antonyms