As the drunk has observed, you can't fall off the floor.
If you're looking for a term for a system which is highly immune to failure, "resiliant" comes to mind.
Take Tesla's solid-state, no-moving-parts one-way fluid valve. It has no moving parts to break (though it could conceivably be fouled by dust, dirt, sediment, or debris).
The first is "impossible".
The second is "pre-failed".
As the drunk has observed, you can't fall off the floor.
If you're looking for a term for a system which is highly immune to failure, "resiliant" comes to mind.
Take Tesla's solid-state, no-moving-parts one-way fluid valve. It has no moving parts to break (though it could conceivably be fouled by dust, dirt, sediment, or debris).
http://makezine.com/2012/01/05/the-tesla-valve-one-way-flow-...
"Overengineered" is another possibility.