thick as two short planks

English

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Adjective

thick as two short planks (not comparable)

1. (informal, simile) Very stupid.

   Synonyms: thick as a brick, thick as a plank; see also Thesaurus:stupid

   • 2017, David Walliams [pseudonym; David Edward Williams], Bad Dad, London: HarperCollins Children’s Books, →ISBN:

     “I dunno. He’s thick as two short planks of wood, but his six brothers are all banged up in here, so he’s got eyes and ears all over the prison. Auntie Flip better watch out.”