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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.
by unicornmoans April 23, 2010
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May 1 Word of the Day
When some little bitchboy is acting like a little tiny pee pee poo poo baby and messing up the group plans.
I’m tired I wanna go home

“Oh I didn’t know it was pee pee poo poo hours”
by A7sa July 03, 2019
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2
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..
by nomnomnomcake:D November 19, 2011
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3
Oh my god, your so dense. I bet even if he kissed you you would be like,"He hates me?"
by SortOfSmart101 August 01, 2016
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5
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.
by *Taylor_Kimi* January 12, 2006
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