have a thick head

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have a thick head

1. To be dim-witted, stupid, or an especially slow learner. I've always had a thick head when it comes to math.
2. To be inflexible or stubborn; to be overly willful or obstinate. Our son has such a thick head. Once he's made up his mind about something, there's no way anyone can change it!
3. Literally, to have an especially dense skull, often said humorously after receiving a mild blow to the head. A: "Oops! Sorry, I didn't mean to hit you!" B: "It's OK, I have a thick head!"
4. To have a painful feeling in one's head or have difficulty thinking clearly, especially as the result of a hangover or illness. Primarily heard in UK. That party was a lot of fun, but I drank a bit too much and had quite a thick head the next morning!
See also: have, head, thick