Student or Learner
Is this sentence appropraite for the usage of rustic?
John is rustic.
It is possible, but we almost never use it without more context. We would say "he's a country boy" or "comes from a farm" but rustic is most often used as an aesthetic description. I bought a house last year and the fence in the back yard is rather rustic in style -- the previous owner wanted it to look like a horse fence.