undefended

These cables and pipes are largely undefended and apparently of great interest to Russia's research vessels.

Canada and the US share deeply integrated economies, a long-standing security partnership and the longest "undefended" border in the world.

Canada and the US share the world's longest undefended border.

It didn’t take long for the Stars to score from there, with Robertson setting up in the slot undefended, taking a pass and wristing the puck past Grubauer to make it 2-0.

And that ruling was left undefended by lawmakers who had every chance to make it the law of the land.