Gormless

ˈɡɔːmlɪs

adjective

lacking intelligence; stupid

The word 'gormless' is primarily used in British English to describe someone who is lacking intelligence or appears stupid. It is often used informally and can be considered a humorous way to describe someone's lack of wit or awareness.

“You didn’t hear him going on about his gormless brother — we’d have been teaching Grawp how to tie his shoelaces if we’d stayed.” “I hate not talking to Hagrid,” said Hermione, looking upset.

J. K. Rowling

Harry Potter and the Half-Blood Prince