hardened criminal

Even when you've put them down, some of the most hardened criminals will deny they did anything wrong.

Those who responded to the offer were probably not the city's most hardened criminals.

Tom's words don't seem like the reflections of a hardened criminal.

Instead, the agency should go after hardened criminals, they said.

I had probably been put in with him to keep me from the company of the real hardened criminals who filled this prison.

For it has turned out that the Captain, like most hardened criminals, is a man of his word.

You reacted to him as if he were a hardened criminal.

"Such hardened criminals form groups if they are allowed to stay at one place for a long time," he said.

So terrible a situation ought to have troubled the mind of the most hardened criminal.

He's already given out my personal information to half the hardened criminals in the country.