Definition of "unbreachable" [unbreachable]

• Impossible to breach (adjective)

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• "The monastery in which the novel takes place is supposed to be impregnable and unbreachable, which is why Sarge chose it for his boarding school."
• "* 3.8 pct/GDP deficit target "unbreachable" - PM * Final budget vote in Nov seen key test for govt (Adds more detail, comments)"
• "When an organisation can count the police and elected officials as its co-conspirators it seems impervious to outside attack, imperious even, impermeable and unbreachable."