redundant

adj. /rɪˈdʌn.dənt/ B2

多余的；累赘的；被裁的

Unnecessary because something is more than what is needed.

仙境例句

With the door gone, its key was redundant; Alice had no use for it.

门都没了，钥匙也成了多余的东西，爱丽丝已经用不着它了。