ondoordringbaar (bn):
impenetrabile(en) of a fortress or other fortified place: able to withstand all attacks., impermeabile(en) preventative of any penetration; impenetrable, impermeable., inattaccabile(en) of a fortress or other fortified place: able to withstand all attacks., inespugnabile(en) of a fortress or other fortified place: able to withstand all attacks.
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Via: Memodata.com