Canny

adj.

Heard in Offaly, Donegal and Sligo

Clever, shrewd or sly.

In use

That lad is a canny cunt, he managed to snake in de back door a de nightclub, posin' as de DJ!

Posh English

That fellow is a remarkably sly bounder. He managed to slip through the rear entrance of the nightclub by posing as the disc jockey.

Same phrase, other counties