Hearts boss Robbie Neilson blasted his players after they threw away a lead to lose to Dundee.
Ellis Simms had the dominant Jambos in front in the first half, but they missed other chances to go further ahead.
It all fell apart after the break and a Toby Sibbick own goal and then a Danny Mullen winner made it 2-1.
The home manager was far from impressed by his side's defending, nor the way they let the game get away from them after appearing to be in control.
"It's very frustrating," he said. "We played very well in the first half, created loads of good chances and were in total control.
"But we didn't take these chances and started to get a bit over complacent. We didn't do what we'd been doing in the first half. We were quite aggressive in our passing and went behind them in the first half.
"Second half we were too static with our play. It was all side to side and not enough penetration. When we did actually penetrate we got chances.
"But we need to do better than we were. My biggest frustration to be honest was defensively. I thought we were very poor at the two goals.
"We've had a brilliant defensive record recently, but at this moment in time we've not and we need to get back to that."
