sticks in a bundle are unbreakable
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.
adj
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.
Resilient.
the unbreakable spirit of the rebels
Not able to be broken in.
noun
Something that cannot be broken.