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.
Showing a lack of professionalism, experience or talent.
Non-professional.
Created, done, or populated by amateurs or non-professionals.
A person whose abilities are less than normal.
That part of the axis of a curved line which is intercepted between the ordinate and the normal.
denormal
Less than normal.