Meaning of DENSE in English

DENSE

(THICK) [adjective] -r, -st - thick; close together; difficult to go or see throughA dense crowd waited for the arrival of the President.There will be dense fog in northern parts of the country tomorrow.The body was found hidden in dense undergrowth.Books with dense print (= with the words printed small and close together) can be difficult to read.It took me a long time to read that philosophy book because it was rather dense (= contained a lot of information and ideas and was difficult to understand).(figurative informal) We've got some really dense (= stupid) people in our class.

Cambridge English vocab.      Кембриджский английский словарь.