(management, slang) A person who is stuck in their ways; one who is unwilling to try new ideas.
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(colloquial, humorous) A stupid person; sometimes one who is being stubborn to the point of stupidity.
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Add your own interpretation of "concrete-head".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.