Simon Moore admitted the it was a frustrated dressing room following Friday night's stalemate in the Steel City derby.
The goalkeeper, who produced a wonderful fingertip save to deny Adam Reach at the death, felt the Blades should have won the clash.
He remarked: "We're frustrated, especially with them going down to ten-men. We dominated the game, but w without doing enough to win it.
"We're dominating teams without getting the result at the moment and that's frustrating, we just need that bit of luck or a bit of quality."
On his crucial contribution, the stopper added: "I've come to punch the initial cross and Stears has got there first, but luckily I've managed to get back up and make the save, because it was a decent volley.
"I didn't have much more to do. We've come a long may from playing in League One, to being disappointed that we've not won a second steel city derby.
"We've played a lot of established Championship sides this season and dominated too, the likes of Derby and Bristol City, but it is frustrating at the moment."