OFF-LINE is a term used to describe a computer or device that is not connected to the internet. It is also used to describe a situation in which a person is not connected to the internet, such as when they are not using a computer or other device. INOPERABLE is another way of saying that something is not working or functioning properly. Therefore, OFF-LINE and INOPERABLE can be used interchangeably to describe a computer or device that is not connected to the internet and is not functioning properly.