Created, done, or populated by amateurs or non-professionals.
Showing a lack of professionalism, experience or talent.
Non-professional.
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.
Executed in the manner of a master; showing competence and skill; masterful.