dense

/dɛns/
adjective
  1. Having parts that are close together; thick or compact.
    • The city's dense population makes public transportation essential.
    • She baked a dense, heavy loaf of whole-wheat bread.
    • The forest was so dense that sunlight barely reached the ground.
  2. Difficult to understand because of complexity or a lot of information.
    • The lecture was dense, covering decades of research in one hour.
    • His writing is dense with references to philosophy and history.
    • The textbook was too dense for beginners to follow.
  3. Slow to understand; stupid or unintelligent (informal).
    • I explained it three times, but he's still being dense about it.
    • She felt dense for not catching the joke earlier.
    • Don't be so dense — the answer is obvious.
Antonyms
What does "dense" mean? | whatsthatwordmean | whatsthatwordmean