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American Dictionary of the English Language

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Impenetrable


IMPEN'ETRABLE, adjective [Latin impenetrabilis; in and penetrabilis, from penetro, to penetrate.]

1. That cannot be penetrated or pierced; not admitting the passage of other bodies; as an impenetrable shield.

2. Not to be affected or moved; not admitting impressions on the mind. The hardened sinner remains impenetrable to the admonitions of the gospel.

3. Not to be entered by the sight; as impenetrable darkness. Hence,

4. Not to be entered and viewed by the eye of the intellect; as impenetrable obscurity or abstruseness.