adj.软弱的，不能自卫的，无防御的

The village was completely defenceless against the invading army.
这个村庄完全无法抵御入侵的军队。
Without any weapons, they were defenceless against the attackers.
没有武器，他们对攻击者毫无防备。
The city's defences were in a state of disrepair, leaving it defenceless.
城市防御设施处于破败状态，使其变得毫无防御能力。
She felt defenceless after losing her job and all her savings.
失业并耗尽所有积蓄后，她感到自己无依无靠。
The old man was defenceless when the robbers broke into his house.
当强盗闯入他的房子时，老人毫无还手之力。
Their lack of knowledge about the local customs made them feel defenceless.
他们对当地习俗的无知使他们感到无力应对。
The small country was defenceless against the economic sanctions imposed by its neighbors.
这个小国无力对抗邻国施加的经济制裁。
After the betrayal by his closest ally, he felt utterly defenceless.
在最亲密盟友背叛后，他感到完全孤立无援。
The company's IT system was defenceless against cyber attacks due to poor security measures.
由于安全措施不足，公司的IT系统对网络攻击毫无防御力。
When she realized she was being followed, she felt completely defenceless.
意识到有人跟踪她时，她感到完全无助。