The Canaries were 4-0 down at half time and were unable to stop City from extending their lead after the break.
Speaking after the match, Hughton said that his players weren't good enough and called on them to stop conceding goals.
"It was difficult from start to finish. We knew the quality they had and they showed that today," he told BBC Sport.
"You have to be resilient but you can't concede the goals we did. For our standards they were too soft, except the Yaya Toure free kick and one that was offside. We are conceding goals, we need to stop that and stop it straightaway."
Norwich are 18th in the Premier League, one point from safety.