(as) thick as two short planks
UK slangvery stupid:
He's a very skilled football player but he's as thick as two short planks.
Thesaurus: synonyms and related words
Stupid and silly
- absurd
- adolescent
- against your better judgment idiom
- asinine
- bananas
- be crazy about sb/sth idiom
- certifiable
- dozy
- drink, laugh, etc. yourself silly idiom
- drivel
- dumb
- empty-headed
- gibber
- loony
- loopy
- lumpen
- lumpish
- madcap
- slow
- wrongheaded
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