Preposition: against

• attack: Total security - Statistically impregnable against brute force attacks.

Adjective complement with noun phrase

• make: The walls of this rise up from a rocky base that made the fortress well nigh impregnable.

Modifies a noun

• fortress: The security of our land is founded on the myth of the impregnable fortress.

• castle: Further inland you will find the ancient extinct volcanoes and the impregnable castles of the Auvergne.

• defense: Our brave soldiers of hope finally breached the seemingly impregnable defenses of the cynical hatchet men who confronted them.

• wall: When dawn was come all those starving peasants may well have stood before the high impregnable walls in the broad daylight of despair.

• position: They had seen a seemingly impregnable position snatched away by a moment of madness from their goalkeeper.

• stronghold: My impregnable stronghold will not have a hidden back door.

Modifying Another Word

• seemingly: The Record, once the seemingly impregnable bible of the Scottish working class, has been humbled.

• virtually: Pele towers were virtually impregnable stone built tower houses with walls three to four feet thick.

• almost: Theodosius left Britain in a defensive situation; the towns had been refortified and made almost impregnable with high strong walls.

• apparently: From this material he builds up an apparently impregnable argument in favor of the revived eastern cult.

• supposedly: It was supposedly impregnable, but Joab made a daring assault via the water shaft, and the city fell.

• so: Bond's self-assurance was so impregnable that his women needed ludicrous identities and pumped-up sexuality to compete.

Used with adjective complement

• consider: This fort, with a Mysore garrison of more than 3500, was considered impregnable.

• seem: But the Tomb you've gotta destroy seems impregnable.

• look: In the blue corner, Tony Blair, whose ten year reign looks as impregnable as ever.

• appear: The system is made to appear impregnable by a constant production of new forms of ideology.

• make: Theodosius left Britain in a defensive situation; the towns had been refortified and made almost impregnable with high strong walls.

• remain: The ground is shaken by earth tremors; but in spite of all, for 700 years the channels have remained well-nigh impregnable.