CANNY

adj. (cannier, canniest)

1. a shrewd, worldly-wise. b thrifty. c circumspect.

2 sly, drily humorous.

3 Sc. & N.Engl. pleasant, agreeable.

Derivatives:

cannily adv. canniness n.

Etymology: CAN(1) (in sense 'know') + -Y(1)