detractor

名词 detractor:

1. one who disparages or belittles the worth of something
   同义词：disparager, depreciator, knocker

1. In her preface she pours out vials of wrath on her detractors.
   在序言里她对她的诽谤者表示愤慨。
2. The scheme is better than its detractors suggest.
   这计划比贬低它的人所说的要好。