"tough mentality" is correct and usable in written English.
You can use it in any context where you need to emphasize an outlook or attitude of strength and resilience. For example, "With a tough mentality and a strong work ethic, he was able to achieve his goals."
They have a tough mentality.
The irresistible, fluid play and tough mentality shown when coming from behind in the two Real Madrid encounters, which both ended 2-2, stand out.
Porte was, after all, intended to be the team's leader for the Giro d'Italia this year, while there has been speculation for several years that Thomas's all-round ability, massive engine and tough mentality might make him a possible overall contender for the Tour in the style of Wiggins.
It takes a tough mentality to get out of a losing mind-set and they haven't found the solution yet.
Harder work and a tougher mentality have been vital, too.
"That's exactly what we've been emphasizing over the last couple of days -- to have that tougher mentality and to buckle down and get stops and execute when we need to to win games," said Sprewell, who struggled offensively in scoring 5 points and shooting 2 of 13.
Liverpool defender Kolo Toure has warned £28m Manchester City new boy Wilfried Bony he will need a tougher mentality to survive at his former club.
Toughen you up, gives you a tougher mentality and strengthens your immune system.
Wilson has the N.F.L. arm and tough, aggressive mentality in the pocket to make big plays.
And even though she was not the most naturally gifted player, her tough, grinding mentality helped lead her to success.
A "tough love" mentality insinuates that people need to "hit rock bottom," whether it's arrest, loss of possessions, or health problems, before they will change.
