Anyone who's breviloquent manages to say a lot using a small number of words. A perfectly expressive, deeply moving haiku is a breviloquent form of poetry — just three brief lines.
Speaking with brevity, or conciseness, makes you breviloquent. Both words are derived from the Latin root brevis, or "short." If you like to keep things short and sweet, your friends may describe you as breviloquent. And while some writers produce fat, sprawling novels of 600 pages, others create breviloquent poems using very few, carefully chosen words.