laconism
Extreme brevity in expression.
uncountable
“Well, where have you been?” he said to her with offhand laconism.
A very or notably brief expression.
countable
The hand of PROVIDENCE writes often by abbreviatures, hieroglyphicks or short characters, which, like the Laconism on the wall, are not to be made out but by a hint or key from that SPIRIT which indited them.
Where it comes from
From Latin Laconia, from Ancient Greek Λακεδαίμων (Lakedaímōn, “the region surrounding the city of Sparta”).
Adapted from the Wiktionary entry laconism (CC BY-SA 4.0).