The Thunder were beaten 96-91 by the Utah Jazz in Salt Lake City to lose the series 4-2.
Adams scored 19 points and pulled down 16 rebounds in the loss.
Russell Westbrook scored a game high 46 points for the Thunder, but missed numerous 3-point attempts to try and tie the game up as the clock ran down.
Adams and Westbrook were the only players in the Thunder lineup to reach double figures in scoring.
Rookie Donovan Mitchell led the way for the home team with 38 points.