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.
A group of people who are cooperating can succeed in a situation where an individual person cannot.
Sticks in a bundle can’t be broken but sticks taken singly can be easily broken. Same applies to people.
a stick in a bundle is unbreakable
Alternative form of sticks in a bundle are unbreakable.
a twig in a bundle is unbreakable
Alternative form of sticks in a bundle are unbreakable.
Example Bank
6
01
unbreakable comb
Wiktionary
02
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.
Wiktionary
03
the unbreakable spirit of the rebels
Wiktionary
04
The salesman claimed the windshield was unbreakable, testing it with a punch that went straight through it.
Tatoeba · #792719
05
After a few dozen unrequited infatuations, Herb's heart became unbreakable.
Tatoeba · #792720
06
An unbreakable walnut in Bern has taken several casualties: 17 nutcrackers, 29 teeth, and a hammer.
Tatoeba · #792723
Usage Notes
i Register
In some senses, unbreakable is marked as figuratively. Watch for register when choosing this word.