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The phrase "impregnable about" is grammatically correct and can be used in written English
It means "impossible to overcome or break through." Example: The walls surrounding the castle were impregnable about, making it a formidable stronghold against enemy attacks.
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Beyond that, I don't detect anything monolithic or impregnable about this literary establishment except a belief in the importance of spelling and punctuation.
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They loved trading stories about his impregnable penthouse office, the daring burglary at his lavish Long Island estate, his insatiable appetite for beautiful young women and his uncanny instincts -- especially, that inexplicable hunch that allowed him to profit from the San Francisco earthquake of 1906.
Hopefully we'll be hearing less about how impregnable Apple's OSes are after this little event (and those other ones).
WASHINGTON — Amid mounting tensions over whether Israel will carry out a military strike against Iran's nuclear program, the United States and Israel remain at odds over a fundamental question: whether Iran's crucial nuclear facilities are about to become impregnable.
It will leave a panicked ANC – forget about its apparently impregnable parliamentary majority, the ANC knows history better than most – facing two socialist movements that originated from within its ranks: a democratic socialist front made up of disenchanted unionists and a black nationalist socialist party made up of the firebrands it expelled.
How about Switzerland once considered an impregnable money center?
"The hosts batted patiently, reaping full reward as they moved into an impregnable position (although we said that about Yorkshire last week).
Last year, Roberts joked about heading to the "impregnable island fortress" of Malta, where he taught after he enraged conservatives with his vote to uphold President Barack Obama's health care overhaul.
"What about institutions that are less impregnable, maybe a chain link fence, a picket fence or two?" asked Frank.
But up against such an impregnable military giant, what was more important about Shehada were his skills as a recruiting officer, his radicalism, and his campaigning abilities - reflected in a popular support for Hamas now that stretches far beyond its hard Islamic core.
How about Switzerland--once considered an impregnable money center?
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com