Adebola scored to make it 1-1 agaisnt a West Ham side which included Freddie Sears but Forest were undone by an Obinna hat-trick.
Forest, who were watched by the Sky Blues today, travel to Coventry on Tuesday night for a Championship fixture at the Ricoh Arena (Kick Off 7.45pm)
Former City loanee Peter Clarke scored an own goal as Huddersfield Town lost 2-1 at Arsenal whilst Lee Hughes played in Notts County's 1-1 draw with Manchester City.
In the other game, Stoke won 1-0 at Wolves with an 81st minute goal from Robert Huth.