1) Conciseness 2) Curtness 3) Laconicism 1) Laconicism 2) Terseness 3) Terseness of expression 
• (n.) A vigorous, brief manner of expression; laconic style. • (n.) An instance of laconic style or expression.
Lac'o·nism noun [ Greek ..., from ... to imitate Lacedæmonian manners, to speak laconically: confer French laconisme .] 1. A vigorous, brief manner of expression; laconic style. 2. An instance of laconic style or expression. 
[n] - terseness of expression
laconism 1. A laconic (brief) way of expression. 2. A brief and sententious (expressing much in few words) manner of expression. 3. The habit or practice of imitating the Lacedemonian manners; especially, in brevity of speech.
laconicism noun terseness of expression
[Difficult words] terseness of expression[Obscure words] terseness of expression