"Unexploded bombs" refers to explosive devices that have not yet detonated or gone off.
Sentences with «unexploded bombs»
The world is riddled with unexploded bombs left behind following munitions tests and warfare. (newscientist.com)
Unexploded bombs still occasionally turn up during construction work. (businessinsider.com)
A free school plagued with problems at its proposed new site next to an airfield — including asbestos and the threat of unexploded bombs — is delaying its... (schoolsweek.co.uk)