incisive
in.ci.sive \in-'si--siv\ aj 1: CUTTING, PENETRATING 2: ACUTE, CLEAR-CUT ISP: INCISIVE implies a power to impress the mind by directness and decisiveness; TRENCHANT implies an energetic cutting or probing deeply into a matter so as to reveal distinctions or to reach the center; CLEAR-CUT suggests the absence of any blurring, ambiguity, or uncertainty of statement or analysis; CUTTING implies a ruthless accuracy or directness wounding to the feelings; BITING adds a greater implication of harsh vehemence or ironic force; CRISP suggests both incisiveness and vigorous terseness - in.ci.sive.ly av SYN syn TRENCHANT, CLEAR-CUT, CUTTING, BITING, CR
Webster's English Dictionary