A brace from Lewis Grabban and a third goal from Ryan Yates was enough to see of Huddersfield, who created plenty of chances before Karlan Grant added a consolation from the penalty spot, condemned to defeat.
Here are the match ratings from a disappointing afternoon for the Terriers.
Jonas Lossl, 7: Couldn't do much about any of the Forest goals.
Demeaco Duhaney, 7: Got forward well in the first half as the hosts' full-backs pushed forward, was subbed with 15 minutes to go.
Richard Stearman, 7: Defended well for the most part could have had a goal after getting into a good position at the other end but Grant could not find him.
Christopher Schindler, 6: Lost concentration in the heart of the defence early in the second half as Grabban scored, which proved costly. Town punished by Forest's cutting edge.
Harry Toffolo, 6: Showed plenty of tenacity getting forward but was slack in defence.
Jonathan Hogg, 6: Subbed with an hour gone but helped the Terriers dominate the ball while on the pitch.
Lewis O’Brien, 6: Struggled to find an end product.
Andy King, 6: Helped Town control possession but saw his side punished by a clinical Forest outfit. Hit the crossbar with a header at 2-0.
Chris Willock, 6: Failed to make a big impact.
Alex Pritchard, 8: Was subbed on the hour but helped the Terriers get forward with intent. Unlucky not to be awarded a penalty in the first half.
Karlan Grant, 6: Scored a late consolation from the spot, could have had more if not for some smart defending from Sammy Ameobi and good goalkeeping from Brice Samba.
Substitutes: Emile Smith Rowe (Pritchard 60), 8.
Trevoh Chalobah, (Hogg 60), 7.
Jon Stankovic (Stearman 70), 6.
Fraizer Campbell (Willock 70), 7.
Juninho Bacuna (Duhaney, 74), 5.
Substitutes not used: Coleman, Kachunga, Quaner, Daly.