#keenness

• Sharpness — A popular, archaic, or regional term designating the quality of being sharp, the cutting edge or pointed tip of a tool; the action of sharpening a cutting instrument or its result. Figuratively and in literature, it can indicate mental alertness, penetration, or harshness in speech.
• Sharpness — The property or quality of being sharp or cutting; the degree of accuracy or thinness of a blade or tip. In a sensory and technical sense, it defines the extreme clarity of an optical image (resolution), the penetration of a mental faculty (intelligence, perspicacity), or the high frequency of a sound (acute pitch).