Unbreakable

adj.resilient, kindprofessional

Meaning 1

Built to resist breaking under expected force or use.

Reach for it when Describing a material object designed for exceptional durability.

The field kit stores samples in an unbreakable inner case.

everyday
durable
long service matters more than absolute strength
not when allows wear and eventual failure
professional
shatterproof
resistance to cracking is the exact feature
not when not for flexible items or emotional bonds
formal
indestructible
near-total resistance to physical ruin
not when often overstates ordinary durability

Too strong in loyalty, resolve, or relationship to be destroyed.

Reach for it when Praising a human bond or commitment that survives severe strain.

Years of shared work formed an unbreakable trust between the crews.

everyday
inseparable
people remain closely connected
not when not for resolve or trust held at a distance
warm
enduring
a bond continues across time
not when does not stress survival under attack
literary
steadfast
loyalty refuses to weaken
not when better for a person or quality than a relationship

unbreakable container
An unbreakable container protected the specimens during the descent.
unbreakable bond
Their unbreakable bond endured years on different continents.
unbreakable resolve
Unbreakable resolve carried the rescue campaign through winter.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.