laconic

From Latin Lacōnicus, meaning "Spartan," itself from Ancient Greek Λακωνικός (Lakōnikós), "Laconian."

Laconia was the region ruled by the Spartans, who were famous for their terse, clipped way of speaking. The place name eventually became a word describing that very trait of brevity.

It shares its root with "Laconia" and "Laconian," the geographic names for the Spartans' homeland — the adjective is essentially a description of their reputation turned into everyday vocabulary.