defenceless
adjective UK (US defenseless) uk/dɪˈfens.ləs/ us/dɪˈfens.ləs/
没有防卫能力的，不能自卫的
Defenceless people, animals, places, or things are weak and unable to protect themselves from attack.
a small defenceless child 毫无自卫能力的小孩
a defenceless city 没有防卫能力的城市
They were defenceless against the enemy bombs. 面对敌人的轰炸，他们几乎毫无防卫能力。