- impenetrablemidnightanimpenetrablemysteryimpenetrabletolightformanimpenetrablecoverover.Shewasimperturbable,inscrutable,impenetrable.Theirjargonisimpenetrabletoanoutsider.Themotiveforthecrimewasimpenetrable.amanimpenetrableby[to]pityIfindhisstylesome...
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