empty-headed

he's completely empty-headed and can't remember a thing.

don't ask her; she's always been a bit empty-headed.

the empty-headed student failed the exam without even trying.

it's frustrating dealing with someone so empty-headed.

he gave an empty-headed speech that bored everyone.

she seemed empty-headed after hitting her head on the table.

the empty-headed politician offered no concrete solutions.

i was shocked by his empty-headed response to the serious question.

the movie plot was so predictable and empty-headed.

an empty-headed idea is better than no idea at all.

he's an empty-headed fool who doesn't think before he acts.