undestroyable
1. [ adjective ] very long lasting
Synonyms: indestructible perdurable undistroyable durable
Examples:

"less durable rocks were gradually worn away to form valleys" "the perdurable granite of the ancient Appalachian spine of the continent"

Related terms: imperishable
2. [ adjective ] not capable of being destroyed
Related terms: indestructible
Similar spelling:   undistroyable
  unadjustable
  undesirable
  undesirably