impregnable /im-pregˈnə-bl/

1. That cannot be captured, broken into or taken by force
2. Which cannot be overcome, unassailable

impregnabilˈity noun

impregˈnably adverb

• gemmeries
• gemmery
• gemmier
• gemmiest
• gemmiferous
• gemming
• gemmiparous
• gemmological
• gemmologies
• gemmologist
• gemmologists
• gemmology
• gemmulation
• gemmulations
• gemmule
• gemmules
• gemmy
• gemological
• gemologies
• gemologist
• gemologists
• gemology
• gemony
• gemot
• gemots