I'm having a discussion with someone. He is saying that since you can say 'the old', you can say 'the ignoble' and although I've never heard or seen it, I think he's right. He wants to say a person did something ignoble. So: 'He did the ignoble' which sounds off to me.
That doesn't seem right to me. He provided two quotes:
Becoming a baseball star is a noble dream, but to do that, some players did the ignoble, ingesting and injecting dangerous and often illegal substances.
Disney was in desperate need of new funds, so he swallowed his artistic pride and did the ignoble: he began to take for-hire assignments.