The patient is terminally ill.

这个病人病入膏肓。

《柯林斯英汉双解大词典》

The terminally ill should be allowed to die with dignity.

应该允许垂危病人死得有尊严。

《牛津词典》

How much to tell terminally ill patients is left to the discretion of the doctor.

晚期病人的病情让本人知道多少由医生自行决定。

《牛津词典》

which former Alaska Governor Sarah Palin said on the Internet would decide whether terminally ill senior citizens would live or die.

VOA: standard.2009.08.22

Well, the reason for thinking otherwise, the reason for not being utterly dismissive of this suggestion, is that when people get ill, terminally ill, it often seems to take them by surprise.

其他的想法产生的原因，人们没有完全摒弃这个假设的原因，是当人们得病，病入膏肓时，这通常让人措手不及。

耶鲁公开课 - 死亡课程节选

Two hundred seventy people were killed in the attack. Opposition Scottish Labor leader Iain Gray was blunt in his criticism of Justice Secretary Kenny MacAskill, who made the call to allow Abdel Basset al-Megrahi to leave prison and return home to Libya on compassionate grounds because he is terminally ill.

VOA: standard.2009.08.24

It's mission accomplished for Ryan, now an official U.S. Marine, and his terminally ill father.

CNN: Dying veteran's wish to see his son graduate comes true

Paul worked in a hospice where he sat among the terminally ill and watched them die.

NEWYORKER: The Valetudinarian

Aetna ran a more modest concurrent-care program for a broader group of terminally ill patients.

NEWYORKER: Letting Go