uneinnehmbar (bn):
ondoordringbaar(en) too strong to be defeated or overcome.
(en) of a fortress or other fortified place: able to withstand all attacks., ongenaakbaar(en) impregnable, unconquerable., oninneembaar(en) impregnable, unconquerable., onneembaar(en) impregnable, unconquerable.
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Via: Memodata.com