QPR made a fight of it in the end - but there was no papering over the cracks of a fourth defeat in six games.
New striker Idrissa Sylla gave Rangers hope with a debut goal at 2-0, but for three quarters of the game, table toppers Huddersfield called the shots.
Jimmy Floyd Hasselbaink needs all the coaching skills he can muster to get his flagging troops back on track in time for the EFL Cup tie against Sunderland on Wednesday, because another first half like this one - and the game will be out of sight long before the end.
Early on, Huddersfield got an early let off when Christopher Schindler's clearance cannoned off Conor Washington. On a luckier day, the ball might have ricocheted back towards goal.
And then it was Rangers backs to wall big time.
There was no pressure on Rajiv van La Parra as he crossed for teenager Kasey Palmer to nod in from four yards with Rs defence staring at each other.
It was a poor goal to give away after the mauling from Newcastle midweek, and then almost in frustration when Tjaronn Chery and Jonathan Hogg mixed it for a handbags well-earned yellow card each.
Rangers played most of the rest of the first 45 minutes in their own half, and had only two efforts to remind Terriers keeper Danny Ward why he was there.
Shy of half an hour recalled Massimo Luongo had a go from more than 25 yards but the effort was well wide of the mark. Tjaronn Chery then tried his luck from much the same distance, but Ward was equal to it as might be guessed from that distance.
Loud shouts for a Huddersfield penalty were turned away on 57 minutes, and straight after Rs hearts were in mouths when Nhaki Wells had the ball in the net only to see the assistant's flag raised.
It mattered little to the home team when Huddersfield went 2-0 up seconds later.
Tommy Smith was given the freedom of the right to cross to the back post for Elias Kachunga to head over Alex Smithies and in.
It was Smith and a head injury that held up play, and it might have given the defender a headache - but it gave his side a bigger one when Sylla pulled a goal back.
Chery had two bites of the cherry to dink a ball to the back post and the sub was on hand to rise highest and halve the defecit.
The added time was frantic as Rs desperately sought a leveller, but the home side held on.