undesirable

不受欢迎的、不想要的、有害的

This medication can cause several undesirable side effects.

这种药物可能造成几种不良的副作用。

不合适的、不理想的正式

Many parents considered him an undesirable match for their daughter.

许多家长都认为他不是女儿理想的对象。

不受欢迎的人、不良份子贬义

The new policy was meant to keep undesirables out of the neighborhood.

新政策的用意是把不良份子挡在社区之外。