From Longman Dictionary of Contemporary Englishrazor-sharpˌrazor-ˈsharp adjective1very sharp
razor-sharp teeth► see thesaurus at sharp2intelligent and able to think quickly
He has a razor-sharp mind.Examples from the Corpusrazor-sharp• The twist of pain was razor-sharp, but the words had acted like a cold shower.• But the other was swollen and half closed, with a Technicolorbruise below it right down to her razor-sharpcheekbone.• I loved the pointybeard and razor-sharp eyes, the pearlearringfixed in his left lobe.• A razor-sharp line divided the quick from the newly grown.• He was known for his brilliance, for his razor-sharp mind and for being a wonderfulpreacher.• She trembled at the razor-sharpsleet of misery: losing Lucy.• Over millions of years, some of the reptiles developed razor-sharpteeth.
