Definitions for "Unserviceable"
To present participles which come from intransitive verbs, or are themselves employed as adjectives, to mark the absence of the activity, disposition, or condition implied by the participle;
Keywords:  impossible
impossible to use
Keywords:  firearm, longer, fit, reason, firing
A firearm which, for any reason, is no longer fit for firing.
not ready for service; "unserviceable equipment may be replaced"