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2Significado: unconquerableinvincible indomitable impregnable unyielding unassailable
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3Significado: fastimpregnable strong resistant
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4Significado: resistantfast strong impregnable
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5Significado: propertysolid compact firm resistantimpenetrable secure impregnable strong
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6Significado: defensiblejustifiable impregnable tenable
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7Significado: dreadfulfierce appalling impregnable dreadfearful frightful horrible formidable