dense

/ˈden(t)s/

Latin densus; akin to Greek dasys thick with hair or leaves

adjective

  1. marked by compactness or crowding together of parts

  2. having a high mass per unit volume

  3. slow to understand : stupid, thickheaded

dense vegetation

Carbon dioxide is a dense gas.

stupid dull dense crass dumb mean lacking in power to absorb ideas or impressions. stupid implies a slow-witted or dazed state of mind that may be either congenital or temporary. dull suggests a slow or sluggish mind such as results from disease, depression, or shock.