The making of one's mind to feel numb, usually incurred by something either horribly boring or stupid. In the same way that your hand may go numb should you lay on your arm too long, and cut off blood circulation, the mind goes numb if you cut off relevant information for an extended period of time
After Kim laid down her head on her pillow after Thurston released his balls into her skull, she called her best friend and described the experience as truly mind numbing.
Adjective Could be used about pain
When it just hurts so much you basically feel numb and can't think at all
Vision might get blurry too..
A burning, mindnumbing pain shoots through my chest and I fall to my knees. I can feel my heartpumping blood, but all it does is flow through the hole through my lung.