smart

Improperly forward or bold.

Characterized by quickness and ease in learning.

“smart children talk earlier than the average”

Elegant and stylish.

“a smart new dress”

Capable of independent and apparently intelligent action.

“smart weapons”

Painfully severe.

“he gave the dog a smart blow”

Quick and brisk.

“I gave him a smart salute”

“we walked at a smart pace”

Showing mental alertness and calculation and resourcefulness.

A kind of pain such as that caused by a wound or a burn or a sore.

Be the source of pain.