A person who can read people's moods and get them to respond to him and do what he wants is an example of someone who would be described as canny.
A businessman who does not overpay for supplies is some who is canny.
- call “canny”; hence, go cautiously
- the tactic, as by a labor union, of intentionally slowing down factory production
Idioms and Phrasal Verbs
Origin of canny
- From can
From American Heritage Dictionary of the English Language, 5th Edition