Steven Gerrard scored the only goal of the match on a 76th minute penalty.
Adams said: “I made sure we were tough to beat but unfortunately one moment of madness cost us.
“I’m certainly not going to have a go at Bouba Diop as he has worked his socks off.”
He added: “I’m very pleased (with our play) but it we come away with nothing. I thought we deserved something.”