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impotent
impound
impoverish
impracticable
impractical
imprecate
imprecation
imprecise
impregnable
impregnate
impresario
imprescriptible
impress (1)
impress (2)
impression
impressionable
impressionism
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impregnable

im·preg·na·ble [ im prégnəb'l ]


adjective 
Definition:
 
1. impossible to break into: too strong to be captured or entered by force
an impregnable fortress

2. unbeatable: unable to be shaken or destroyed by any outside influence
impregnable faith


im·preg·na·bil·i·ty [ im prègnə bíllətee ] noun
im·preg·na·bly [ im prégnəblee ] adverb
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