Webster
✕

Webster’s Revised Unabridged Dictionary · 1913

Impenetrable

Im·pen′e·tra·ble (ĭm·pĕn′ē·trȧ·b'l), a. [L. impenetrabilis; pref. im- not + penetrabilis penetrable: cf. F. impénétrable.] 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.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.