Deathless/ˈdeθləs/ Definition 1 of 3Pro Tip 1/2Mythical Usage Used to describe beings in stories that live forever, like gods in myths. In the legend, the deathless sorcerer granted wishes to those who found him. Pro Tip 2/2Figurative Expression Sometimes it's used metaphorically for things that seem to last forever. Their deathless devotion to each other was admired by everyone.