His action was indefensible.他的行为不可原谅。

She described the new policy as 'morally indefensible'.她认为新政策“在道德上站不住脚”。

The checkpoint was abandoned as militarily indefensible.这个边检站因军事上无法防守而被放弃了。

To argue otherwise is trying to defend the indefensible.以其他的方式辩解实际上就是想强词夺理。