adj.未获答复的，悬而未决的，未回答的，未解答的，未回复(或答复)的

The phone rang for a long time, but no one answered.
电话响了很久，但没人接听。
She posed a question, but it remained unanswered in the discussion.
她提出了一个问题，但在讨论中却没有得到回答。
There are still many unanswered questions about the accident.
关于这次事故，仍有许多未解的问题。
His email to the customer service department was left unanswered.
他给客户服务部的邮件没有得到回复。
The survey had a high percentage of unanswered questions.
这项调查中有很大比例的问题未被回答。
The doorbell rang, but there was no answer from inside.
门铃响了，但里面没有人回应。
The doctor asked about his medical history, but he had too many unanswered questions.
医生询问他的病史，但他有太多问题没有答案。
The mystery surrounding her disappearance remains unanswered.
她失踪的谜团仍然没有解开。
He asked for help, but his cries went unanswered.
他请求帮助，但他的呼救声无人回应。
The teacher's question about the math problem hung unanswered in the air.
老师关于数学问题的提问在空气中悬而未决。