I'll simplify/expand on that if I may...
Serviceable: A transient event where all the systems on an aircraft are functioning in the manner they were "advertised". Serviceability changes from second to second. At any moment during any flight items may change from serviceable to unserviceable. The effect on overall safety of the aircraft and crew should be mitigated by other systems or procedures on an airworthy aircraft.
Airworthy: A permanent state within each modification state of an aircraft. All systems function exactly as expected at all times and there are no unpredictable, unmitigated events. Airworthiness does not change during a flight but only with modifications to the aircraft or it's components.
Un-Airworthy: A state of build or modification that has known areas of failure or potential failure that are ignored, avoided or remain unmitigated that will have catastrophic consequences for the aircraft or crew.
Criminal Negligence: A state were men and women who place their trust in their superiors are knowingly expected to fly aircraft that have known, unmitigated and unaddressed problems that might result in the loss of the aircraft and it's crew, (see Un-Airworthy).
The forces is a dangerous game. Everyone who joins to be at the pointy end knows that and understands that they might die a premature death even during training. It's the nature of the game. But to place additional, unnecessary dangers on those fine young men and women because it costs a few shekels to save them from dying unnecessarily is worse than criminal. It's time to start treating our servicemen and women the way they deserve rather than treating them as "Tommy".