Monica recently bought a rucksack that was described on its wonderful label as 'indefectible'. Hwne I saw that I assumed it was one of those made-up words that translators occasionally manage to create from a mangle of similar words. I was wrong. It is a real word.
Indefectible adj. - Having the ability to resist decay or failure; lasting; having no flaw or defect; perfect.
I just wish I were indefectible!
In a religious context the indefectibility of the Church is a gift from Christ to the Church by which she is preserved to the end of the age as the "institution of salvation".