Sharpest

adjective

1. Terminating in a point or edge, especially one that can cut easily; not obtuse or rounded.

   "A face with sharp features"

2. Intelligent.

   "My nephew is a sharp lad; he can count to 100 in six languages, and he's only five years old."

3. Higher than usual by one semitone (denoted by the symbol ♯ after the name of the note).
4. Higher in pitch than required.

   "The orchestra's third violin several times was sharp about an eighth of a tone."

5. Having an intense, acrid flavour.

   "Milly couldn't stand sharp cheeses when she was pregnant, because they made her nauseated."