Definition of Impenetrable

1. Adjective. Not admitting of penetration or passage into or through. "Impenetrable rain forests"

Similar to: Dense, Thick
Derivative terms: Impenetrability
Antonyms: Penetrable



2. Adjective. Permitting little if any light to pass through because of denseness of matter. "Impenetrable gloom"
Exact synonyms: Dense, Heavy
Similar to: Thick
Derivative terms: Density

3. Adjective. Impossible to understand. "Impenetrable jargon"
Similar to: Incomprehensible, Uncomprehensible
Derivative terms: Impenetrableness

Definition of Impenetrable

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

Definition of Impenetrable

1. Adjective. Not penetrable. ¹

2. Adjective. (figuratively) Incomprehensible; inscrutable. ¹

¹ Source: wiktionary.com

Definition of Impenetrable

1. [adj]

Medical Definition of Impenetrable

1. 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. 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) Origin: L. Impenetrabilis; pref. Im- not + penetrabilis penetrable: cf. F. Impenetrable. Source: Websters Dictionary (01 Mar 1998)

Impenetrable Pictures

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Lexicographical Neighbors of Impenetrable

impeller
impellers
impelling
impellor
impellors
impels
impen
impend
impended
impendence
impendency
impendent
impending
impends
impenetrability
impenetrable (current term)
impenetrableness
impenetrably
impenetralia
impenitence
impenitences
impenitencies
impenitency
impenitent
impenitently
impenitents
impennate
impenned
impennes
impenning

Literary usage of Impenetrable

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Voyage of the Beagle by Charles Darwin (1909)
"... to Cucao—impenetrable Forests —Valdivia Indians—Earthquake—Concepcion—Great Earthquake —Rocks fissured—Appearance of the former Towns—The Sea Black and ..."

2. The Theory of Sound by John William Strutt Rayleigh (1896)
"The above investigation is limited to the case where the second medium is impenetrable, so that the whole energy of the incident wave is thrown back in the ..."

3. The History of the Decline and Fall of the Roman Empire by Edward Gibbon (1843)
"... firm and impenetrable. (33) A barrier so respectable was seldom violated, and the barbarians often ..."

4. The Harvard Classics by Charles William Eliot (1909)
"... to Cucao—impenetrable Forests —Valdivia Indians—Earthquake—Concepcion—Great Earthquake —Rocks ..."

5. The Confessions of Jean Jacques Rousseau by Jean-Jacques Rousseau (1901)
"... impenetrable obscurity, and in concealing from me his conspiracy, well knowing that, with whatever art he may have formed it, it could never sustain my ..."

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