Origin and history of laconic

"concise, abrupt," 1580s, literally "of or pertaining to the region around ancient Sparta" in Greece, probably via Latin Laconicus "of Laconia," from Greek Lakonikos "Laconian, of Laconia," adjective from Lakon "person from Lakonia," the district around Sparta in southern Greece in ancient times.

The Spartans famously cultivated the skill of saying much in few words. When Philip of Macedon threatened them with, "If I enter Laconia, I will raze Sparta to the ground," the Spartans' reply was, "If." An earlier form was laconical (1570s). Related: Laconically.

When the Samians who had been banished by Polycrates came to Sparta, they went to the authorities and made a long speech, in view of the greatness of their need. At the first meeting, the Spartans said in answer that they had forgotten the first words of the request and could not understand the last. After that, the Samians had another meeting with the Spartan government, and this time they said nothing but, carrying an empty sack, said simply, "The sack needs grain." At this the Spartans answered, "You did not need to say 'sack.'" But they resolved to help the exiled Samians. [Herodotus, transl. David Grene]