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Indestructible
Unbreakable Context
Use 'indestructible' to emphasize strength, often in a literal sense, like with materials or objects. 
Not Literal
'Indestructible' can also describe something not physical, like a bond or a will, signifying it can't be broken. 
Exaggeration
Sometimes 'indestructible' is used hyperbolically to stress durability, not absolute indestructibility. 