For months—for years—his life hadn’t been worth a day’s purchase; and there he was gallantly, thoughtlessly alive, to all appearance indestructible solely by the virtue of his few years and of his unreflecting audacity.
There are no more uses of "indestructible" in the book.
Show samples from other sources
When the fear takes over, use the only thing more powerful, more indestructible, to fight it: your spirit.
Sabaa Tahir -- An Ember in the Ashes
"Nick, don’t let one good turn make you feel indestructible," Go said.