1. a person who preys on others through deception or exploitation
Usage: informal
2. a person who lives by their wits, often through questionable means
Usage: informal; dated

Examples

• The old sharker convinced tourists to buy fake jewelry.
• He was known as a sharker who would take advantage of anyone.
• The casino was full of sharkers looking for easy marks.
• She warned her friend about the sharker trying to sell him a broken car.
• The neighborhood sharker was always running some kind of scam.
• Police arrested the sharker for running a fake charity.