1. difficult questions or problems that are hard to answer or solve
Usage: informal
2. political speakers who travel around making campaign speeches
Usage: informal; political

Examples

• The quiz show featured several real stumpers that left contestants scratching their heads.
• Those math problems were complete stumpers for most of the class.
• The teacher saved the stumpers for the final exam.
• Political stumpers traveled from town to town during the election season.
• The candidate sent stumpers to rural areas to drum up support.
• Even the brightest students found these stumpers challenging.