Showing a lack of professionalism, experience or talent.
Non-professional.
Created, done, or populated by amateurs or non-professionals.
Someone who is unqualified or insufficiently skillful.
A person attached to a particular pursuit, study, science, or art (such as music or painting), especially one who cultivates any study, interest, taste, or attachment without engaging in it professionally.
The property of having been exercised, used, acted upon.
Practiced, trained, experienced.