invulnerable, indestructible, immortal / (figuratively) invulnerable, unfazable, unflappable: not becoming discouraged or frustrated in the face of failure or difficulty

(historical) short for 蝦夷地 (Ezochi): collective name for Hokkaido (mostly), the Kuril Islands, and Sakhalin before the Meiji period

South Australia (a state of Australia)

iris (the flower)