a. [ L. impenetrabilis; pref. im- not + penetrabilis penetrable: cf. F. impénétrable. ]
Highest woods impenetrable
To star or sunlight. Milton. [ 1913 Webster ]
They will be credulous in all affairs of life, but impenetrable by a sermon of the gospel. Jer. Taylor. [ 1913 Webster ]
n. The quality of being impenetrable; impenetrability. [ 1913 Webster ]
a. [ L. penetrabilus: cf. F. pénétrable. ] Capable of being penetrated, entered, or pierced. Used also figuratively. [ 1913 Webster ]
And pierce his only penetrable part. Dryden. [ 1913 Webster ]
I am not made of stones,
But penetrable to your kind entreats. Shak. [ 1913 Webster ]
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a. Impenetrable. [ 1913 Webster ]