razor-sharpприлагательное Extremely sharp or keen, often used to describe something that can cut or pierce easily. The chef's razor-sharp knife sliced through the vegetables effortlessly.
Very clear and precise, often used to describe a person's mind or intellect. Her razor-sharp wit made her a formidable opponent in debates.
Intensely focused or intense, often used to describe a look or gaze. He gave her a razor-sharp glance that made her feel uneasy.