featherheaded
/ˈfɛðərˌhɛdɪd/
adjective
- Silly, foolish, or lacking good judgment; not serious or sensible.
- His featherheaded plan to build a treehouse without any nails fell apart in the first rain.
- The movie's featherheaded villain kept making ridiculous mistakes that made the audience laugh.
- She dismissed his featherheaded comments about the stock market with a patient smile.