unwanted

音标发音

You will have to kill these unwanted plants with poison.
你將不得不用葯物把這些討厭的植物毒死。
《新英漢大辤典》
Unwanted recordings may simply be erased by demagnetizing.
不需要的錄音衹要退一下磁就可以抹掉。
《新英漢大辤典》
They are unwanted by their hosts as well as their customers.
和對客戶一樣，對其主人來說它們也是多餘的。

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.
性關系,將衹是單純爲了生育,而有缺陷的胎兒將會被流掉。
耶魯公開課 - 政治哲學導論課程節選
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.
有些方法能夠終止基因的表達,而這些方法也經証實有廣泛的應用,有很多疾病是源於基因的異常表達,而癌症大概是這種情況最好的例子,但還有很多其他的
耶魯公開課 - 生物毉學工程探索課程節選

"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.
海麪上反射廻來的不需要的襍波就被稱爲海襍波。