Definition of "uncrackable" [uncrackable]

• That cannot be cracked; unbreakable. (adjective)

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• "BD+ has been held out as some kind of uncrackable answer to the DRM wars, and was cited by many pundits for BluRay's victory over HD-DVD in the recent format wars."
• "[92] Israeli scientist says he has developed 'uncrackable' code"
• "DET's "uncrackable" filters will also be applied to the netbooks."