n.病弱；病身
His claim to ownership is invalid. 他的所有權(quán)是無效的。
A passport that is out of date is invalid. 護(hù)照過期是無效的。
His father is a bed-ridden invalid. 他父親是個纏綿病榻的人。
He has been an invalid all his life. 他終身殘廢。
The invalid gained colour under the doctor's care. 病人在醫(yī)生的治療下，臉色逐浙紅潤。
