invalid

无效的、失效的

Your ticket is invalid because the event was rescheduled.

因为活动改期，你的票已经无效。

不成立的、站不住脚的

His argument is invalid because it rests on false data.

他的论点站不住脚，因为建立在错误的数据上。

无效的、不正确的电脑

The system says my password is invalid and won't let me in.

系统显示我的密码无效，不让我登入。

病弱者、伤病者旧式

She spent two years caring for her father as an invalid.

她照顾卧病在床的父亲两年。

因伤病退役、因病除役英式，常用被动

He was invalided out of the army after the accident.

那场意外之后，他因伤从军中退役。