unbreakable

Something that can't be shattered, cracked, or easily destroyed is unbreakable. If your new cellphone is truly unbreakable, it will hold up no matter how many times you drop it on the floor.

Use this adjective for anything that's physically durable, like the unbreakable glass used for car windshields or the unbreakable plastic bottles that ketchup comes in. It's impossible, or nearly impossible, to break these things. Things that are figuratively unbreakable can't be destroyed either, like the unbreakable bond between twins or the unbreakable secret code used by spies.

Definitions of unbreakable
1

adj impossible to break especially under ordinary usage

unbreakable plastic dinnerwear”
Synonyms:
infrangible
difficult or impossible to break or separate into parts
shatterproof, splinterless, splinterproof
resistant to shattering or splintering
Antonyms:
breakable
capable of being broken or damaged
brickle, brickly, brittle
having little elasticity; hence easily cracked or fractured or snapped
crumbly, friable
easily broken into small fragments or reduced to powder
short
tending to crumble or break into flakes due to a large amount of shortening
delicate, fragile, frail
easily broken or damaged or destroyed
frangible
capable of being broken
splintery
subject to breaking into sharp slender pieces
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