这些火车噪音大、肮脏且不可靠。

The trains were noisy, dirty, and ___unreliable.

来自那个网站的信息常常不可靠。

Information from that website is often ___unreliable.

别找约翰帮忙，他完全靠不住。

Don't ask John to help, he's completely ___unreliable.