a. 违反行业习惯的, 违反行业道德的, 不合行规的, 非职业性的, 外行的
在线英汉词典

unprofessional的短语、例句：

unprofessional adj (derog贬) 1 (esp of conduct) contrary to the standards expected in a particular profession （尤指行为）违反职业准则的
The board considers your behaviour highly unprofessional. 董事会认为你的行为严重违反职业道德. 2 (of a piece of work, etc) not done with the skill or care of a trained professional （指一件工作等）未按专业水平做的
He made a very unprofessional job of putting up the garden shed for us. 他给我们搭的花园棚屋很没水平.