thick as a plank
thick as a plank adjective: very stupid.
Adjective
thick as a plank (not comparable)
- Very stupid.
Synonyms of thick as a plank
- thick as a brick
- thick as two short planks
- addlebrained
- addlepated
- airheaded
- bee-brained
- beef-witted
- soft
- beefheaded
- beetle-headed
30 more synonymsFewer synonyms
- birdbrained
- blockheaded
- Boeotian
- boneheaded
- boofheaded
- braindead
- brainless
- bubbleheaded
- buffle-headed
- bullet-headed
- cerebrally challenged
- childish
- chowderheaded
- chuckleheaded
- crackbrained
- cretinous
- daft
- dense
- dented
- dim-bulb
- dim-headed
- dim-witted
- dim
- doltish
- dopey
- dozy
- drowsy
- dull-headed
- dull-minded
- dull-witted
Questions about thick as a plank
- What does thick as a plank mean?
- Thick as a plank means very stupid.
- What part of speech is thick as a plank?
- Thick as a plank is an adjective.
Words near thick as a plank in the dictionary
Source and license
Adapted from Wiktionary: thick as a plank (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.
Last updated:
Pronunciation audio from Wikimedia Commons, each file under its own free license: En-au-thick as a plank.ogg.
Cite this entry: “thick as a plank.” Word.ws, https://word.ws/thick_as_a_plank. Based on Wiktionary, CC BY-SA 4.0.