The Molineux outfit started on the back foot but wrestled back control in the second-half before ultimately going ahead through Raul Jimenez.
And Nuno was pleased with how his side responded after half-time.
"The second half was better," the Portuguese said. "Leeds started very strong and caused us enormous problems.
"We adjusted it better as the game went on and kept on growing. The answer in terms of fitness was good.
"Until the end, we defended well. It was better in the second half, better with the ball and creating more chances.
"It's about the identity, we know we have to have organisation and stay in the game. The character of the team was evident, especially in the effort of the players.
"Again, the answer in terms of fitness and energy was much better.
"We had chances, good situations, before and after the goal. Raul was fortunate with his strike, but he had good situations before and we had a good goal ruled out. So, it was good.
"The clean sheet is a big satisfaction. This is the bounce back we desired, a second clean sheet."