ondoordringbaar (bn):
undurchlässig(en) not penetrable.
(en) preventative of any penetration; impenetrable, impermeable., ehern(en) extremely strong., stark(en) extremely strong., sturmfrei(en) of a fortress or other fortified place: able to withstand all attacks., unangreifbar(en) of a fortress or other fortified place: able to withstand all attacks., unbezwingbar(en) of a fortress or other fortified place: able to withstand all attacks., undurchdringlich(en) extremely strong., uneinnehmbar(en) of a fortress or other fortified place: able to withstand all attacks., widerstandsfähig(en) extremely strong.
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Via: Memodata.com