The exemption, Dr Denholm reckons, is "totally worthless".

德诺姆博士认为这种豁免“毫无价值”。

youdao

At some level in her heart, she was looking at her son and she was saying 'if you turn out happy, if you have a great life, and you love me, then I'll feel like my life wasn't totally worthless.

在某种程度上，她会在心里说：“儿子，如果你最终能有一个幸福美满的人生，而起你也爱我的话，我就不会觉得我的人生是个毫无价值的人生。”

youdao

You end up with a system where hundreds of thousands of people have degrees that are totally worthless.

ECONOMIST: Universities in Latin America

The debt must have been created or acquired in your business or closely related to your business when it became partly or totally worthless.

FORBES: Taxes From A To Z (2013): B Is For Bad Debt Expense