rattlebrained

She was a rattlebrained fool who would undoubtedly giggle and take it as a great joke when the Cauldron-Born came for him.

Why, Jack, Jack, what a thoughtless, rattlebrained chap you are.

Through a rattlebrained friend of theirs, one Nancy Spencer, they agree to take a boy from the Hopeton Orphanage.

A rattlebrained imp with a horse between her knees from daylight to dark, riding the country wild, insulting old age, and laughing at me and putting the devil into the head of my grandson!

But I am afraid you are glorifying two rattlebrained chaps who should be in a home for imbeciles instead of in the castle their audacity might have blighted.