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.
A specialist in a given field whose opinion is highly valued, especially in one of the fine arts or in matters of taste.