Synonyms of the word 
SHATTERPROOF → SPLINTERPROOF - UNBREAKABLE
shatterproof
- adj. Resistant to shattering; difficult to break.
splinterproof
- adj. (military) resistant to fragments of exploding shells.
unbreakable
- adj. difficult to break and therefore able to withstand rough usage.
- adj. (of a horse) not able to be broken in.
- n. Something that cannot be broken.
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