“业余的”的英语可以翻译为：amateurish，extracurricular，sparetime，afterhours ...

他有那种难以言表的特质，体现出他是专业而非业余的。He has that je ne sais quoi that distinguishes a professional from an amateur.职业高尔夫球员通常胜过业余的.A professional golfer usually has it all over an amateur.你是专职的, 我是业余的.You are a professional, but I am...