a. not wanted; not needed
a. 没人要的, 不需要的, 多余的
1. The email went to my spam folder because it was unwanted.
这封邮件进入了我的垃圾邮件文件夹，因为它是不需要的。
2. She decided to donate her unwanted clothes to charity.
她决定把不需要的衣服捐给慈善机构。
3. Unwanted noise can make it hard to concentrate while studying.
不必要的噪音会让学习时很难集中注意力。