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"娯楽として携わるアマチュアの
例:an amateur painter アマチュア画家
an athlete who does not play for payお金をもらわずに競技する人門外漢
someone who pursues a study or sport as a pastime娯楽として研究またはスポーツを継続する誰か非家
lacking professional skill or expertise; "a very amateurish job"; "inexpert but conscientious efforts"; "an unskilled painting"専門の技術または専門知識が欠如しているさま素人臭い