The win snapped the Terps three-game skid.
Fielding an inexperienced lineup, the Terps gave up two penalties and a host of fouls against the Scarlet Knights.
Jacen Russell-Rowe and Joe Suchecki each scored, while Ben Bender impressed in the midfield.
The Terps fell behind 3-0 after 30 minutes, doomed by early mistakes and ruthless Nittany Lions finishing.
The Terps added two midfielders and a goalkeeper.