concrete-head

plural concrete-heads

1. colloquialhumorousA stupid person; sometimes one who is being stubborn to the point of stupidity.

   As far as I can determine, I am a bleeding heart liberal. Personally I think that's way preferable over a concrete-head conservative, if given a choice between the two.

   2004 January 5, Rainy, “Does anyone know”, in alt.fan.keanu-reeves (Usenet), retrieved 02 Aug 2022

   2 more examples

   "So get dressed and stop scowling. I'll tell you about it later." He hoped that would be enough but her scowl deepened. He met it with a grin. "I regret nothing." "Of course not, you're a concrete-head. Have you heard anything from Enrique?"

   2014 September 19, Benjamin Kane Ethridge, Black & Orange, Bad Moon Books Digital

   It had taken his little ten year-old sister telling him to stop being a concrete-head to get him to fly across the solar system. Now, the only thing keeping him from returning to the two most important people in his life was this asshole dragging his heels.

   2016 July 7, Wesley Chu, Time Siege, Duncan Baird Publishers, →ISBN

2. slangmanagementA person who is stuck in their ways; one who is unwilling to try new ideas.