- strong enough to resist or withstand attack; not to be taken by force, unconquerable: an impregnable fort.
- not to be overcome or overthrown: an impregnable argument.
Origin of impregnable1
Synonyms for impregnableSee more synonyms for on Thesaurus.com
Antonyms for impregnable
Related Words for impregnabilityfreedom, security, sanctuary, immunity, shelter, cover, defense, refuge, asylum, assurance, invulnerability, safeness, impregnability, inviolability
Examples from the Web for impregnability
Contemporary Examples of impregnability
That is an astonishing spell of impregnability, one that looked set to last through to a penalty shoot-out tonight.Germany Wins, World Cup Justice Is Served
July 13, 2014
Historical Examples of impregnability
If any spot can impress the notion of impregnability it is Kuffstein.Maurice Tiernay Soldier of Fortune
Charles James Lever
Of course his impregnability gave rise to all manner of stories.The New Tenant
E. Phillips Oppenheim
But its impregnability could not offset its gross imprudence.Benjamin Franklin
John Torrey Morse, Jr.
These were old and had not been repaired, since the Saguntines trusted in the impregnability of the steeps.Snnica
Vicente Blasco Ibez
If any spot can impress the notion of impregnability, it is Kuffstein.
- unable to be broken into or taken by forcean impregnable castle
- unable to be shaken or overcomeimpregnable self-confidence
- incapable of being refutedan impregnable argument
Word Origin for impregnable
- able to be impregnated; fertile
early 15c., imprenable "impossible to capture," from Middle French imprenable "invulnerable," from assimilated form of in- "not, opposite of" (see in- (1)) + Old French prenable "assailable, vulnerable" (see pregnable). With intrusive -g- 16c., on model of deign, reign, etc. Related: Impregnability.