Definitions

1. adjective

unreliable or untrustworthy.

“The shady businessman had a sharky reputation in the city.”

2. noun

a shark or shark-like person.

“The diver was surrounded by a group of sharky fish.”

3. adverb

in a way that is unreliable or untrustworthy.

“He was doing business sharky, making money off other people’s ideas.”