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Webster 1913 Edition
Impenetrably
Im-pen′e-tra-bly
,adv.
In an impenetrable manner or state; imperviously.
“Impenetrably armed.” Milton.
“Impenetrably dull.” Pope.
Webster 1828 Edition
Impenetrably
IMPEN'ETRABLY
,adv.
1.
With hardness that admits not of impression; as impenetrably dull.