Definitions from Wiktionary (thick as a plank)
▸ adjective: (simile, informal) Very stupid.
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▸ adjective: (simile, informal) Very stupid.
Similar:
thick as two short planks,
thick as a brick,
thick,
thick as mince,
dumb as a brick,
thick as pigshit,
dumb as a doorknob,
dumb as a stump,
thick-brained,
dumb as a rock,
more...
Opposite:
Phrases:
▸ Words similar to thick as a plank
▸ Usage examples for thick as a plank
▸ Idioms related to thick as a plank
▸ Wikipedia articles (New!)
▸ Popular nouns described by thick as a plank
▸ Words that often appear near thick as a plank
▸ Rhymes of thick as a plank
▸ Invented words related to thick as a plank