The word "uncanny" has quite a few interpretations depending on your exact
meaning.
If you mean "strange" then use the sign for "STRANGE."
"Uncanny Resemblance."
According to Neil Turner in a "Quora" comment: "The phrase ["uncanny
resemblance"] used about two objects, quite often people, looking so similar
that it feels as though there should be an unnatural or supernatural reason for
it. You probably should not use [the phrase] to describe identical twins, since
the resemblance is entirely expected and explained by genetics. It is more
likely to be used of a so-called doppelganger, a person who so resembles someone
else unrelated that it seems there must be some other-worldly explanation."
Source: Turner, N. (11/17/2016), "What does the phrase 'the
resemblance is uncanny' mean?" Quora, retrieved 2019-07-08 from
https://www.quora.com/What-does-the-phrase-the-resemblance-is-uncanny-mean
If by "uncanny resemblance" you mean that two things have an amazingly strong
resemblance then you could use a combination of LOOK-STRONG +
TERRIBLE-[1h-version / used as an intensifier] + [context].
If you mean that two things have such a strong resemblance that it seems
unnatural you might want to add that GOOSEBUMPS sign. See: Goosebumps: https://youtu.be/g16JINNLKpg
You could match the concept to one of the dozens of other signs that you could
use to mean "uncanny" (STRANGE, WEIRD, SEEM IMPOSSIBLE, SHOCKED, JAW DROP,
WHIPLASH, etc.) -- depending on exactly what you mean.
Consider the difference between:
1. There is an uncanny resemblance.
2. The resemblance is uncanny!
There are many shades of meaning that could include: strong, can't explain it,
spooky, shocking, etc. Each meaning might best be signed using a different
combination of signs or different inflections of particular signs.
See: Intense: https://youtu.be/iIs-ZMgqy-8
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