I agree that it's hard to define.
I've seen some that are an hybrid, not "pure" anime but cooperation of european-japanese companies. They have a feel/look of anime, but they aren't in the true sense of the of what we consider anime...
Here's a favorite of mine:
I've seen some that are an hybrid, not "pure" anime but cooperation of european-japanese companies. They have a feel/look of anime, but they aren't in the true sense of the of what we consider anime...

Here's a favorite of mine: