unwanted

音标发音

You will have to kill these unwanted plants with poison.
你将不得不用药物把这些讨厌的植物毒死。
《新英汉大辞典》
Unwanted recordings may simply be erased by demagnetizing.
不需要的录音只要退一下磁就可以抹掉。
《新英汉大辞典》
They are unwanted by their hosts as well as their customers.
和对客户一样，对其主人来说它们也是多余的。

This interferes with the friends' discussion C just as unwanted sales messages interfere with communication over the Internet.
Sexual relations will be intended purely for the sake of reproduction and unwanted fetuses will be aborted.
性关系,将只是单纯为了生育,而有缺陷的胎儿将会被流掉。
耶鲁公开课 - 政治哲学导论课程节选
These are ways to stop a gene from being expressed, and there turns out there's lot of applications in that, lots of diseases result from the unwanted expression of certain kinds of genes and cancer is probably the best example of that, but there are many.
有些方法能够终止基因的表达,而这些方法也经证实有广泛的应用,有很多疾病是源于基因的异常表达,而癌症大概是这种情况最好的例子,但还有很多其他的
耶鲁公开课 - 生物医学工程探索课程节选

"We select out the unwanted cell types to achieve pure stem cells, " explains Kraus.
FORBES: Cell makers

If you say that something or someone is unwanted, you mean that you do not want them, or that nobody wants them.

不需要的
The unwanted clutter reflected from the sea surface is called sea clutter, which has bad influence on the radar detection and position tracing.
海面上反射回来的不需要的杂波就被称为海杂波。