impregnable /im-pregˈnə-bl/

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

• nomen
• nomenclative
• nomenclator
• nomenclatorial
• nomenclators
• nomenclatural
• nomenclature
• nomenclatures
• nomenklatura
• nomenklaturas
• nomen nudum
• nomes
• no messing
• -nomic
• nomic
• nomin.
• nomina
• nominable
• nominal
• nominal account
• nominal accounts
• nominalisation
• nominalisations
• nominalise
• nominalised