1. Absurdities: a foolish act or idea.

2. Asininity: a foolish act or idea

3. Absurdity: a foolish act or idea

4. Such a foolish act could be harmful —even deadly.

5. His foolish act has brought a storm about his ears.

6. Hesitating, Eline pushed open the door, it seemed fatuous to knock, a foolish act of politeness in the circumstances.