from The Century Dictionary and Cyclopedia
- Stupid; thick-skulled; thick-headed.
Sorry, no etymologies found.
Gypsy Joe wondered how such a thick-brained super had reached that rank.
She pushed her men to the margins, these effeminate incompetents or thick-brained dupes, either way easy prey for the mysterious women who glide through the smoky bars and dank streets like piranhas in a muddy river.
He was too thick-brained to think for a moment that I should ever trouble to prepare two diaries, one for myself and one for capture if detected, so I still held the treasured original, which I instantly hid away safely.
"Fool yourself, you thick-brained Frisian," broke in Martha angrily,
Among other things, he asked him, "Is it not true the Germans are somewhat thick-brained?" to which the fawning professor replied with a smile.