unreliable

形容词 unreliable:

1. liable to be erroneous or misleading
   同义词：undependable
2. not worthy of reliance or trust
   同义词：undependable
3. dangerously unstable and unpredictable
   同义词：treacherous
4. lacking a sense of responsibility

1. She was totally unreliable, so she got/was given her marching orders.
   她完全不可靠，所以给解雇了。
2. His sudden departure demonstrates that he's unreliable/how unreliable he is.
   他突然离去表明他不可靠[他多麽不可靠]。
3. The postal service here is very unreliable.
   这里的邮政服务很不可靠。
4. Lacking a sense of responsibility; unreliable or untrustworthy.
   不可靠的缺乏责任心; 不可靠或不值得信赖的
5. Dennis is a very unreliable worker and needs watching like a hawk.
   丹尼斯是一个很不可靠的工人，因而需要密切监视他。