daft
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(as) daft as a brush
slang Strange or silly. Primarily heard in UK. Quit being as daft as a brush—it's too dangerous to play on this busy street! Everyone thought I was daft as a brush growing up—my head in the clouds, lost to dreams of impossible things. I know some of my students think I'm as daft as a brush because of my weird methods.
be as daft as a brush
slang To act in a strange or silly way. Primarily heard in UK. Quit being as daft as a brush—it's too dangerous to play on this busy street!
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
daft as a brush
BRITISHIf someone is as daft as a brush, they are very silly or stupid. She was as daft as a brush. Couldn't say anything with any sense in it. Note: This expression may have come from `as soft as a brush', as both `soft' and `daft' can mean stupid. Alternatively, it could have come from a fuller version, `as daft as a brush without bristles'.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
(as) ˌdaft as a ˈbrush
(British English, spoken) (of a person) very sillyFarlex Partner Idioms Dictionary © Farlex 2017