nonbreakable

/nɑnˈbreɪkəbəl/
adjective
  1. Designed to resist breaking; unbreakable or very difficult to break.
    • For camping, I prefer nonbreakable dishes over ceramic ones.
    • They installed nonbreakable windows in the school gymnasium.
    • The toddler's cup is made of nonbreakable plastic so it won't shatter if dropped.