The Terriers remain embroiled in relegation trouble after they went down to George Boyd's second-half effort.
Robins felt his side had made big strides when they won at West Yorkshire rivals Leeds before the international break, but a sixth home league defeat has left them two points above the relegation zone.
Too many of Huddersfield's players are playing without confidence and Robins conceded his side is struggling.
"We weren't good enough," he said. "I don't think it was a great game by any stretch of the imagination.
"We restricted them to very little, but it's a difficult formation to play against, how they play it and with the quality of players they've got, they're obviously up there for a reason."
Robins acknowledged Boyd's fine winner, but felt Town striker James Vaughan had been fouled in the build-up.
"There was a real push in his back, but we can't blame incidents like that, we've got to come out and be better that this," he added.
"We go to Bolton on Tuesday and have seven games left. It's an interesting end to the season."