dead loss
noun/ˌded ˈlɒs/
/ˌded ˈlɔːs/
[usually singular] (British English, informal)- a person or thing that is not helpful or useful
无用的人（或物）；废物 - He may be a very talented designer, but as a manager he's a dead loss.
他可能是一个很有天赋的设计师，但作为经理他却很无能。
- He may be a very talented designer, but as a manager he's a dead loss.