DictionaryunbreakableResistant to breaking
adjective

unbreakable

un-BRAY-kuh-bul/ʌnˈbreɪkəbl/

Impossible or very difficult to break.

The nearly unbreakable steel link remains intact under opposing forces.

A strong steel link remains intact under two opposing pulling forces shown with short arrows, while a separate brittle plastic link is broken nearby.
Etymology

The negative prefix denies the possibility expressed by break plus -able. Breaking need not mean physical damage: the earliest cited use concerns a law that could not be broken.

In context

The Best Seat in History143:49
the genuine, unbreakable trust of a true son, tested to the limit and found solid.
You've Been Wrong About Temptation (The Bible Explains Why)

More examples

  • No phone screen is truly unbreakable.
  • Their years of friendship create an unbreakable bond.
  • She treats her promise as an unbreakable commitment.

Forms

unbreakable

breakable adjective — Capable of being cracked or broken.

Similar words

shatterproof
Specifically resists shattering into pieces, especially glass or plastic.
durable
Withstands wear over time, not necessarily sudden force.