Laconic: using few words; terse; concise.  Laconic means brief. 

Laconic comes from the Greek region Laconia, land of the ancient Spartans.  The Spartans were famous for their blunt speech.   

King Phillip of Macedon once threatened to invade Spartan territory.  “If I invade Laconia you will be destroyed, never to rise again.”

The Spartans sent back a laconic reply.  “If.”

Synonyms for Laconic: brusque, brief, pithy, terse, succinct