undesirable

不受歡迎的、不想要的、有害的

This medication can cause several undesirable side effects.

這種藥物可能造成幾種不良的副作用。

不合適的、不理想的正式

Many parents considered him an undesirable match for their daughter.

許多家長都認為他不是女兒理想的對象。

不受歡迎的人、不良份子貶義

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

新政策的用意是把不良份子擋在社區之外。