Synonym: invincible, resistant, strong, unassailable, unconquerable. Similar words: pregnant, pregnancy, impress, imprecise, impressive, impression, enable, unable. Meaning: [ɪm'pregnəbl] 
adj. 1. able to withstand attack 2. capable of conceiving 3. incapable of being overcome, challenged or refuted.
adj. 1. able to withstand attack 2. capable of conceiving 3. incapable of being overcome, challenged or refuted. 
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1 The lofty walls of the castle seemed impregnable.
2 The team built up an impregnable 5-1 lead.
3 The Bundesbank's seemingly impregnable position has begun to weaken.
4 Surrey have been building up an impregnable lead in this season's County Championship.
5 They will establish impregnable fortresses.
6 Subject, verb, object: the unadorned, impregnable sentence.
7 Fortify thyself with contentment: that is an impregnable stronghold. Epictetus 
8 Occupying fairly impregnable clifftop villages, they prospered in the practice of agriculture.
9 As a working theory this is impregnable, whether considered sceptically or superstitiously.
10 It must be impregnable, especially if attacked by the adherents of those long established religious beliefs that confer privileges.
11 The Confederates considered the works impregnable, but they did not depend solely upon them.
12 The case Starr builds must be as impregnable as Fort Knox.
13 The great and impregnable fortress is accessible by means of four highways built on lofty viaducts.
14 Grant was still mired in the mud before impregnable Vicksburg.
15 And Andrus would be untouched, impregnable behind his rigid simplicities.
16 The heights of Kennesaw were impregnable.
17 On this problem,(www.Sentencedict.com) she was impregnable.
18 " The lines around Kennesaw Mountain are impregnable.
19 The old Dutch fort with its thick high walls looks virtually impregnable.
20 Despite burglar alarms and window locks, homes are never impregnable against determined thieves.
21 Almost the only place where the Conservatives did badly was the normally impregnable Birmingham.
22 It was stacked with the usual assortment of crates and containers, impregnable behind an ingenious array of clamps and locks.
23 Although encircled by its enemies, I knew just how impregnable it was.
24 The one factor that still tilts general election predictions in the Tories' favour is that their hillcrest position seems ultimately impregnable.
25 Built in 1537 of brick, it has immense circular mural towers and massive, impregnable walls.
26 They did not want to waste their time, effort, money and future chances in taking on an impregnable President.
27 Its plush vegetation crowded the restraining fence that had been made strong, damned near impregnable, to hold it back.
28 The conventional wisdom having been made more or less identical with sound scholarship, its position is virtually impregnable.
29 Their mountainous homeland with its fortress valleys was a near impregnable base from which to sally forth.
30 The problem invariably is that the enemy is simply inflexible or impregnable.
More similar words: pregnant, pregnancy, impress, imprecise, impressive, impression, enable, unable, tenable, amenable, definable, untenable, personable, examinable, attainable, abominable, reasonable, inalienable, sustainable, interminable, unreasonable, unattainable, unimaginable, comprehensible, unquestionable, incomprehensible, impalpable, implacable, impermeable, impeccable.