"This is a fantastic victory for us, great credit to the players," said Adkins.
"The work-rate was phenomenal, we tried to pass and we showed character yet again. We have been very resolute. I am very proud of the players."
Kevin Blackwell, the Sheffield United manager, said Scunthorpe were deserved victors.
"We have had 10 injuries and I have got a squad of 22. We couldn't fill the bench. But to use it as an excuse would disrespect Scunthorpe, who were at it and deserved the win."