adj.<主英>无防御的,无保护的,不能自卫的,无助的
The village is defenceless against attack.
这个村庄毫无防御能力。
This was a sickening attack on a pregnant and defenceless woman.
这一起对毫无防御能力的孕妇的袭击,令人无比震惊。
He voiced his solidarity with the weak and defenceless.
他表示自己同弱势和无助群体站在一起。