Canny? That's uncanny!

[fandango]

Is it an "uncanny resemblance" or a "canny resemblance"?

What is canny?

[xcheopis]

canny (adj):
1. cautious and shrewd
2. wise and well-informed

uncanny (adj):
1. mysterious and eerie, weird
2. so good, acute, etc. as to seem preternatural

[tomndebb]

Canny is related to ken, knowledge. An uncanny resemblance is one that is beyond knowing or understanding how it could be such a close resemblance.