unbreakable

adj

1. Difficult or impossible to break and therefore able to withstand rough usage.

   “unbreakable comb”

   “His 14 singles titles still look like a typo even for those like me who have watched him build that probably unbreakable record, red brick by red brick.”

2. (figuratively)Resilient.

   “the unbreakable spirit of the rebels”

3. Not able to be broken in.

noun

1. Something that cannot be broken.