What is the term for explosive munitions that have not exploded as intended?

The term "Dud" refers to explosive munitions that failed to detonate as intended upon impact or activation. This terminology is widely used in explosive ordnance disposal and military contexts to describe munitions that are still present on the battlefield but do not function as designed. The potential danger of duds lies in their unpredictable nature; they can still explode if disturbed or subjected to certain conditions, posing a significant risk to personnel and civilians.

The other terms do not accurately describe this scenario. "Live Ordnance" refers to munitions that are functional and capable of detonation, which is the opposite of a dud. "Defective Device" implies an inherent flaw that may not be solely related to its failure to explode as intended, but rather could indicate a wider range of issues with the device itself. "Safe Ordnance" suggests a state where the munitions are deemed secure and not at risk of accidentally detonating, which also does not apply to ordnance that has not detonated but could still be hazardous. Thus, "Dud" is the correct term for unexploded munitions that failed to activate as expected.