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Longman Dictionary of Contemporary English
impenetrable
adjective
COLLOCATIONS FROM CORPUS
■ NOUN
barrier
▪ A decade ago this was Checkpoint Charlie, one of the few gaps in an otherwise impenetrable barrier a hundred miles long.
▪ But this normally impenetrable barrier is easily breached by fat-soluble ethanol molecules, which slip through like little ghosts.
▪ Yet some people seem to learn to live with imperfection and others find it an impenetrable barrier.
▪ A rose hedge can become a useful, impenetrable barrier if clipped regularly.
▪ As she rounded the final corner, the trees were in front of her, a dark and impenetrable barrier hiding the house completely.
EXAMPLES FROM OTHER ENTRIES
▪ an impenetrable 25-page memo
▪ An impenetrable fog halted traffic.
EXAMPLES FROM CORPUS
▪ As she rounded the final corner, the trees were in front of her, a dark and impenetrable barrier hiding the house completely.
▪ Feminist organizations and the media appeared almost impenetrable to us.
▪ Granted, the casual observer may dismiss this as impenetrable blarney.
▪ He would make the Britches impenetrable, tackle the dead trees and plant saplings.
▪ Their bushes form an impenetrable hedge.
▪ We followed their tracks down into the swamp where a recent clearcut had left impenetrable thickets of young fir.
▪ What she once considered oppressive about Joseph, his cold style and impenetrable attitude, now earned her respect.
▪ Which was further away from the real but impenetrable humanity of these black men and women?
The Collaborative International Dictionary
Impenetrable

Impenetrable \Im*pen"e*tra*ble\, a. [L. impenetrabilis; pref. im- not + penetrabilis penetrable: cf. F. imp['e]n['e]trable.]

  1. Incapable of being penetrated or pierced; not admitting the passage of other bodies; not to be entered; impervious; as, an impenetrable shield.

    Highest woods impenetrable To star or sunlight.
    --Milton.

  2. (Physics) Having the property of preventing any other substance from occupying the same space at the same time.

  3. Inaccessible, as to knowledge, reason, sympathy, etc.; unimpressible; not to be moved by arguments or motives; as, an impenetrable mind, or heart.

    They will be credulous in all affairs of life, but impenetrable by a sermon of the gospel.
    --Jer. Taylor.

Douglas Harper's Etymology Dictionary
impenetrable

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.

Wiktionary
impenetrable

a. 1 Not penetrable. 2 (context figuratively English) incomprehensible#English; inscrutable.

WordNet
impenetrable
  1. adj. not admitting of penetration or passage into or through; "an impenetrable fortress"; "impenetrable rain forests" [ant: penetrable]

  2. permitting little if any light to pass through because of denseness of matter; "dense smoke"; "heavy fog"; "impenetrable gloom" [syn: dense, heavy]

  3. impossible to understand; "impenetrable jargon"

Usage examples of "impenetrable".

Foremost of all, emblazoned at the head of every column, loudest shouted by every triumphant disputant, held up as paramount to all other considerations, stretched like an impenetrable shield to protect the weakest advocate of the great cause against the weapons of the adversary, was that omnipotent monosyllable which has been the patrimony of cheats and the currency of dupes from time immemorial,--Facts!

This novel-and the previous three books in THE FIRST AMERICANS Series-has shown how man first came into the Americas by way of the high Arctic, eventually traversed the upper reaches of the Yukon, penetrated the high passes of the Richardson Mountains, reached the shores of the MacKensie River and-facing the impenetrable mile-high walls of the Cordilleran and Laurentide ice sheets-at last turned south along the eastern spine of the Rocky Mountains and headed straight into the heartland of Ice Age America.

Living, as they did, in what appeared to me impenetrable darkness, their eyes were abnormally large and sensitive, just as are the pupils of the abysmal fishes, and they reflected the light in the same way.

In a harsh land composed largely of shifting desert sand and impenetrable mountains, the concept of landownership among any but the monarch was more ephemeral than it would have been in other parts of the world, where the terrain was more stable.

Lastly, all the masses of impenetrable wood which covered the Serpentine Peninsula were named the forests of the Far West.

Still grinning, he followed the freshest tracks away from the midden, hoping for a sighting, and had gone only half a mile when just beyond the wall of grey impenetrable bush that flanked the narrow trail, there was a sudden hissing, churring outcry of alarm calls and a cloud of brown oxpeckers rose above the scrub.

Once she had identified for him the shapes of the leaves and twigs that denoted edible plants, he was an indefatigable assistant, digging with great patience and concentration through the rockiest and most impenetrable soil.

Then they were behind another boulder the size of a Shoshoni lodge, one of five of similar size forming a crude natural fortification, and they could hear more arrows cracking against the impenetrable stone surfaces.

Due to a certain psychic law, intelligent spirits have the faculty of placing about an ignorant spirit a condition simulating a prison, an impenetrable, cell-like room from which there is no escape.

As she followed the Countess, she often turned her eyes with rapture towards the ocean, seen beneath the dark foliage, far below, and from thence upon the deep woods, whose silence and impenetrable gloom awakened emotions more solemn, but scarcely less delightful.

Vaughn warned Eddie that the glass was of a special thickness and laced with chicken wire, which made it nearly impenetrable.

At every point the assailants found the same scattered but impenetrable fringe of riflemen, and the same energetic batteries waiting for them.

Young carried on a short conversation with Boris Dmitrevich in impenetrable Russian, and then did a spot of translation, looking more worried than I liked.

The picture painted by the documents and interrogations showed that while a number of lower-level systems had been read by German codebreakers, the most important ciphers remained impenetrable.

The near side of the construct formed a tangled, impenetrable fence, twisted exuberantly into arcs and cusps, with shards of galaxy images glittering through the morass of spacetime defects.