defenceless

1. ADJ If someone or something is defenceless, they are weak and unable to defend themselves properly. 無防禦的; 無防衛(wèi)能力的

...a savage attack on a defenceless young girl. …對(duì)一個(gè)毫無防衛(wèi)能力的年輕女孩的野蠻襲擊。