if used as a figurative (of a text), then dense means it's hard to understand because of a complexity of ideas...
if dense is used as figurative (of a person), then dense means that it's difficult to explain anything to that person because they can't make sense of complex ideas (because their head is too "dense" or "thick" to get anything through)
It does not mean stupid although it is often used to describe people who are also stupid. For example, a lawyer who argues what the word "is" means could be described as dense. Stupid is lacking in intelligence whereas dense infers that a person's head is too thick to teach anything to him/her.
People who exhaust you by asking for further clarification on anything from policies and procedures by asking questions they wouldn't ask had they understood your previous answer to one of their previous questions are dense - their skulls are too thick to get anything through to their heads so they don't understand even the simplest lowest common denominator definitions!
A dense person is the opposite of an airhead, although about as useful.
If you had to read this definition several times to understand it - and you still don't really understand it, it is because you are dense.
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not exactly stupid, the person can be book smart but can also be: thick headed, clueless, lacking common sense, unable to catch onto hints
Caty: So has he catched on that you like him yet?
Helen: Sigh...no..Peter's so dense..
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Somone who is oblivious to everything.
Oh my god, your so dense. I bet even if he kissed you you would be like,"He hates me?"
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Someone who lacks common sense, acts like an idiot and makes a fool of themselves without realising.
I cant believe she cheated on him and didn't tell him for month, she thought everything would be okay, shes sooo dense.
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Someone who understands subtleties but misses the big picture in a way that's convenient to them or out of self interest but they don't necessarily realize that they're doing it because they're so stuck in their own world and so used to how things are. Someone that only looks at things from their own perspective but never even considers anyone else's perspective and doesn't realize or appreciate how one sided they are.
For example if you complain that your friend is making you sleep in the living room but you miss the fact that he is letting you stay rent free because he wants to help you out and he doesn't owe you anything but you owe him a lot then your are dense. You've gotten so used to being helped out for free and you don't appreciate all that your friend has done for you in return for nothing.
Or if my boss yells at me for little things that aren't really my fault but he completely misses the fact that he owes me a ton of money because he can't afford to pay me right now and that he's only paying me minimum wage and he doesn't even pay overtime or doubletime rates if I work overtime or doubletime and he doesn't pay sick pay and he doesn't comply with any of the labor laws whatsoever and when I quit he acts surprised and complains about how everyone quits on him when things are tough and how everyone is such a quitter but doesn't acknowledge or appreciate anyone's effort while they are working for him it's because he's dense (true story).
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