dud
/dʌd; dʌd/ n
(infml 口) thing or person that fails to work properly 无用的物或人; 废物
Two of the fireworks in the box were duds. 盒子里的烟火有两个是坏的.
The new manager is a complete dud. 新经理完全是个废物.
This battery is a dud. 这电池是废的. dud, adj defective; worthless 有缺点的; 不完善的; 无价值的; 无用的
a dud cheque, ie one that is forged or not backed by cash 无用的支票（假支票或空头支票）.