impregnable, inviolable, secure, strong, unassailable, unattackableadjective
immune to attack; incapable of being tampered with
"an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection"
capable of conceiving
incapable of being overcome, challenged or refuted
"an impregnable argument"; "impregnable self-confidence"
(Of a fortress, wall, etc., also used figuratively) Too strong to be penetrated.
not to be stormed, or taken by assault; incapable of being subdued; able to resist attack; unconquerable; as, an impregnable fortress; impregnable virtue
Etymology: [See Impregnate.]
capable of being impregnated, as the egg of an animal, or the ovule of a plant
Etymology: [See Impregnate.]
Chambers 20th Century Dictionary
im-preg′na-bl, adj. that cannot be seized: that cannot be moved.—n. Impregnabil′ity.—adv. Impreg′nably. [Fr. imprenable—L. in, not, prendĕre, prehendĕre, to take.]
Dictionary of Nautical Terms
Said of a fortress or position supposed to be proof against any attack.
Military Dictionary and Gazetteer
Not to be stormed, or taken by assault; incapable of being reduced by force; able successfully to resist attack; as, an impregnable fortress.
The numerical value of impregnable in Chaldean Numerology is: 3
The numerical value of impregnable in Pythagorean Numerology is: 3
Most people hew the battlements of life from compromise, erecting their impregnable keeps from judicious submissions, fabricating their philosophical drawbridges from emotional retractions and scalding marauders in the boiling oil of sour grapes.
The First Amendment has erected a wall between church and state. That wall must be kept high and impregnable. We could not approve the slightest breach.
Ah, I fancy it is just the same with most of what you call your emancipation. You have read yourself into a number of new ideas and opinions. You have got a sort of smattering of recent discoveries in various fields -- discoveries that seem to overthrow certain principles which have hitherto been held impregnable and unassailable. But all this has only been a matter of intellect, Miss West -- superficial acquisition. It has not passed into your blood.
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"impregnable." Definitions.net. STANDS4 LLC, 2021. Web. 6 Dec. 2021. <https://www.definitions.net/definition/impregnable>.