impregnable /im-pregˈnə-bl/

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

impregnabilˈity noun

• mummifies
• mummiform
• mummify
• mummifying
• mumming
• mummings
• mummock
• mummy
• mummy-case
• mummy-cases
• mummy-cloth
• mummy-cloths
• mummying
• mummy porn
• mummy-wheat
• mump
• mumped
• mumper
• mumpers
• mumping
• mumping-day
• mumpish
• mumpishly
• mumpishness
• mumpishnesses