密 - secrecy, density (pop), minuteness

secret agreement

close (relationship, connection, etc.); intimate; near

crowding together; clustering together; close formation; swarm

secret; private; surreptitious

close adhesion; sticking firmly (to); being glued (to)

smuggling (people); stowing away

density

illicit sale; smuggling; bootlegging; trafficking

poaching

fine (grain, workmanship, etc.); close (weave); delicate; intricate; elaborate

smuggling oneself into a country; illegal immigration

precise; exact; detailed; accurate; minute; close