Longman Dictionary of Contemporary English
The Collaborative International Dictionary
Thick-headed \Thick"-head`ed\, a. Having a thick skull; stupid.
Wiktionary
a. sluggish and obtuse of mind
Usage examples of "thick-headed".
Ginge was proud of his literary style which was culled from the witness-box manner of thick-headed and very junior police constables whose periphrasis he had overheard from the dock.
Dick says these militia soldiers are turrible thick-headed: thicker-headed than any of the colored gentlemen in Number Four.
As the sun had begun its slow ascent over Lochnagargoyle, he had fallen into a deep and mercifully dreamless sleep that now, as he unglued his face from the pillow, made him too slow-witted and thick-headed to appreciate the generosity of the gift Pandora was offering him.
He told me that the burgomaster was a Catholic, a worthy man, well to do, but rather thick-headed.
His great-grandson, a greedy, thick-headed individual, caused the rebellion of the Boxless Freemen against his own clique of Jacksocrats.
Gods-rotted thick-headed Harun had ordered him out, Dahan had said something about his notes, headed back for his room, and Harun had flung him into a wall.
Carella was still grumbling about his thick-headed uncle and Teddy was signing that maybe he should take a nice hot shower before he went to bed because tomorrow was another day, and he wasn't off from school, and there would always be another war to fight in this sorry world of ours and more people out of whom to bomb the S-H-I-T, which word she spelled out letter by letter with her fingers lest Carella miss the point that he was beginning to annoy her.
The urge to hit the thick-headed brute, to land her fist or some heavy piece of scrap metal against the side of his head, welled up in Neelah's breast.