The Reds suffered their heaviest defeat under Freedman as they went down 3-1 away from home in the Championship.
Hosts Norwich took the lead on the stroke of half time when Jonny Howson shot home from close range after being teed up by Wes Hoolahan.
The Canaries made it 2-0 at Carrow Road 11 minutes into the second half, with Cameron Jerome turning in a cross from Martin Olsson.
Chris Burke brought down Olsson inside the Forest penalty box, and Hoolahan made no mistake from 12 yards to make it 3-0 to Forest.
Although Burke pulled one back for the Reds in the 76th minute, it proved to be a mere consolation for the visitors.
Freedman has now admitted that Norwich deserved to win, telling BBC Nottingham Radio: "The better side won the game. Norwich deserved to win.”
#nffc manager Dougie Freedman on 3-1 defeat at Norwich: "The better side won the game. Norwich deserved to win."— BBCNottinghamSport (@BBCRNS) March 21, 2015
Freedman added on Forest's official website: "I felt the better side won the game today. A lot of things didn’t go our way - losing the goals at their particular times didn’t help us and there were one or two missed opportunities in the first half."
Forest had just 36% of the possession, 10 shots of which six were target, and six corners. The Nottingham-based outfit remain ninth in the Championship table with 57 points from 39 matches, 10 points behind sixth-placed Ipswich Town.