A cementhead is someone whose thinking is as rigid, dense, and impenetrable as the building material — a person stubbornly resistant to new ideas, good advice, or basic common sense. It's a step up from blockhead or bonehead: the cement implies not just stupidity but an active, hardened refusal to update their views. You can argue with a cementhead until you're hoarse and they won't budge an inch.
Don't bother explaining it to him again — the man is a complete cementhead who thinks he already knows everything.
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(slang, derogatory) A stubbornly stupid person.
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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.
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