incisive (as in a sharp criticism)

clear (as in a sharp image)

स्पष्ट

English Usage: The picture is very sharp, you can see all the details.

Hindi Usage: तस्वीर बहुत स्पष्ट है, आप सभी विवरण देख सकते हैं।

sharp (as in taste)

sharp (as in a knife)

धारदार

English Usage: Be careful, the knife is very sharp.

Hindi Usage: सावधान रहो, चाकू बहुत धारदार है।