Dud

A dud is an ammunition round or explosive that fails to fire or detonate, respectively, on time or on command. Poorly designed devices (for example, improvised explosive devices (IEDs)), and small devices, have higher chances of being duds.

Duds are still dangerous, and can explode if handled. They have to be deactivated and disposed of carefully. In wartorn areas, many curious children have been injured or killed from tampering with such devices.