Origin of impenetrable
Examples from the Web for impenetrable
At the highest navigable point of the Congo River, thick jungle creates an impenetrable wall of green around a large island.
These reporters are working within a bubble, impenetrable to secular outsiders.
But, as Korda clearly recognizes, Lee himself could be almost as impenetrable as stone.
The Brazilian defense, touted as impenetrable in pre-tournament hype, proved to be bedraggled, and porous.Brazil Slips Past Croatia, Thanks to Yuichi Nishimura|Tunku Varadarajan|June 12, 2014|DAILY BEAST
He had two hits for three official at-bats; yet afterward his solitary gloom was impenetrable.
The secret motives which actuate that mysterious woman are also impenetrable, but her fidelity is beyond a doubt.
He had been prepared for abuse, but not for impenetrable silence.One Day's Courtship|Robert Barr
When under the influence of the latter feeling, his eye never failed to seek the visage of his dull and impenetrable kinsman.The Prairie|J. Fenimore Cooper
But this is really all which is known; and the creation of the poems lies in impenetrable mystery.Short Studies on Great Subjects|James Anthony Froude
So Olear sidled into the all but impenetrable underbrush and slowly, with infinite caution, wormed his way along.Astounding Stories, June, 1931|Various
mid-15c., from Middle French impenetrable, from Latin impenetrabilis "that cannot be penetrated," from assimilated form of in- "not, opposite of" (see in- (1)) + penetrabilis "penetrable" (see penetrate). Related: Impenetrably; impenetrability.