amateur -
engaged in as a pastime; "an amateur painter"; "gained valuable experience in amateur theatricals"; "recreational golfers"; "reading matter that is both recreational and mentally stimulating"; "unpaid extras in the documentary"
nonprofessional not professional; not engaged in a profession or engaging in as a profession or for gain; "the nonprofessional wives of his male colleagues"; "nonprofessional actors"
amateur -
lacking professional skill or expertise; "a very amateurish job"; "inexpert but conscientious efforts"; "an unskilled painting"
unprofessional not characteristic of or befitting a profession or one engaged in a profession; "described in unprofessional language so that high school students could understand it"; "was censured for unprofessional conduct"; "unprofessional repairs"
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Wiktionary
Substantiv
amateur -
A person attached to a particular pursuit, study, or science as to music or painting; especially one who cultivates any study or art, from taste or attachment, without pursuing it professionally.
amateur -
Someone who is unqualified or insufficiently skillful.
An amateur (French amateur "lover of", from Old French and ultimately from Latin amatorem nom. amator, "lover") is generally considered a person attached to a particular pursuit, study, or science, without pay and often without formal training. An amateur receives little or irregular income from their activities, and thus differs from a professional who makes a living from the pursuit and typically has formal training and certifications in the domain.