Indurate is a verb that means to harden or an adjective that means physically or morally hardened.
The Latin word durus (DOO roos) means hard. It has spawned a number of other English words like, durable, endure and duration. As an adjective, If something is indurate is has become hardened over time. To Harden something or someone is to indurate them.
All those years on the police force has indurated Jeff. It has made him indurate to the difficulties of the job.