Cunha, who joined Manchester United from Wolves, has quickly made an impression on his new coach.
Amorim believes that the team's morale is boosted by their performance, not just the results of their games.
"It's not just about winning or losing," Amorim said, "but how we play and the confidence that comes from it."
He also praised the team's chemistry, saying that the players he bought, including Cunha and Bryan Mbeumo, have exceeded his expectations.
"They are great guys and great players," Amorim said, "and we're in a good place right now."
Cunha's personality and playing style have also caught Amorim's attention.
"He's a loud and important player," Amorim said, "and when he's upset, you can feel it in the environment. That's good."
Amorim is happy with the way Cunha has settled into the team and is contributing to their positive atmosphere.