razor-sharp

Adjective

 * 1) As sharp as a razor; extremely sharp.
 * The executioner was proud that he kept his axe razor-sharp, so no prisoner would feel any pain when his head was cut off.
 * 1)  Very clever or quick-witted.
 * 1)  Very clever or quick-witted.

Translations

 * German: ,
 * Greek:
 * Ancient: ξυρήκης
 * Hungarian:
 * Swedish:, rakbladsvass