The Reds let a two-goal lead slip against Brentford away from home in the Championship to settle for a point.
Tyler Walker and Chelsea-owned Todd Kane scored in the second half at Griffin Park to put Forest 2-0 up, but Andre Gray halved the deficit in the 80th minute and Jota headed in the equaliser in the final minutes.
The final 10 minutes were hugely disappointing and dampening for Forest, and Freedman has admitted his frustrations.
“We were fantastic today," Freedman told BBC Nottingham Sport. "I felt we played with commitment, played with spirit and played some fantastic stuff.
"We were the better side, we had the better chances, we were 2-0 up, and we looked very, very comfortable. I have to give credit to Brentford, who kept on going with 10 minutes to go.
"Where I am disappointed - and we will this right - was our naivety. We were very, very naive in the last 10 minutes. We turned over the balls too many times up top…
“I think the record shows that they (Brentford) scored 16 goals this season in the last 10 minutes and I warned the lads. They (Brentford) kept going, they are very resilient side and they has the crowd behind them...
“The point I am trying to make is that we were very naive in the last 10 minutes.”
Over the course of 90 minutes, Forest had 26% of the possession, took 10 shots of which three were on target, and earned five corners.
In contrast, Brentford had 74% of the possession, took 33 shots of which nine were on target, and earned 11 corners.
Forest are currently ninth in the Championship table with 58 points from 41 points, 12 points behind sixth-placed Brentford.