[{"Bold_text": "adjective", "List Items": ["strong enough to resist or withstand attack; not to be taken by force, unconquerable:an impregnable fort.Synonyms: invulnerable Antonyms: vulnerable", "not to be overcome or overthrown:an impregnable argument.Synonyms: unassailable"]}, {"Bold_text": "adjective", "List Items": ["susceptible to impregnation ,as an egg."]}]