1. Hindering or preventing the progress or accomplishment of something: Corruption still stymies the two countries from accomplishing their goals.

The changes in medical insurance must not be allowed to stymie the new medical treatments.

2. To thwart or to stop someone from achieving his or her objective: An explosion in the fitness studio's sauna has been stymieing many people from being able to do their physical exercises and sports.

Progress on the project has been stymied by a lack of qualified personnel.

3. Etymology: originally, a golfing term, indicating a situation on the green where a ball obstructs the shot of another player.

The actual origin is unknown.