adj. 25B6; adjective PENETRATING, acute, sharp, sharp-witted, razor-sharp, keen, astute, trenchant, shrewd, piercing, perceptive, insightful, percipient, perspicacious, discerning, analytical, clever, smart, quick; concise, succinct, pithy, to the point, crisp, clear; informal punchy.
rambling, vague.