They must have irondiscipline and an intense desire to win to get there.
Times, Sunday Times (2012)
He needs to impose irondiscipline on his team to stop this behaviour.
The Sun (2007)
We will need to show an irondiscipline.
The Sun (2013)
Seeill discipline
Definition of 'iron'
iron
(aɪəʳn)Explore 'iron' in the dictionary
adjective [ADJECTIVE noun]
You can use iron to describe the character or behaviour of someone who is very firm in their decisions and actions, or who can control their feelings well.