IPA: /ˈʃætərˌpruːf/
KK: /ˈʃætərˌpruf/
Not able to break or shatter easily, often used to describe materials or objects that are designed to withstand impact.
The shatterproof glass kept everyone safe during the storm.
Shatterproof is formed from "shatter" (from Old English *sceotan*, meaning to throw or break) and "proof" (from Old French *profe*, meaning to test or prove). The word describes something that is resistant to breaking or shattering.
Think of something that is 'tested' ('proof') to ensure it does not 'break' ('shatter') easily — that's what shatterproof means.