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Use "thickheaded" in a sentence
"Rick - no, of course it isn't, and they weren't all 'thickheaded', either :"
"As Private Ashley Williams might say, it takes a special kind of thickheaded to become a new fan in a dying fandom."
"This can be good -- it can mean honesty and forthrightness and openness -- or it can be bad -- they can be thickheaded pests and you have to hit them over the head practically to make them go away!"