For a pointed object:
* Pointed
* Keen
* Acute
* Piercing
* Jagged
* Edged
For a person's intelligence:
* Intelligent
* Clever
* Astute
* Bright
* Witty
* Quick-witted
For a sound:
* High-pitched
* Harsh
* Piercing
* Shrill
For a taste:
* Tangy
* Pungent
* Spicy
* Zesty
For a tool:
* Well-honed
* Well-maintained
* Efficient
Other:
* Precise
* Clear
* Distinct
* Strong
To give you the most accurate synonym, please provide more context about how you are using the word "sharp."