underhander

noun3

1. •
   One who throws or bowls a ball underhand.

   • He was a good pitcher, an underhander with good control. — 2005
2. •
   A ball thrown or bowled underhand.

   • Not that the fast underhanders which were bowled before this innovation could be treated with indifference. — 1865
3. •
   One whose personality inclines toward taking revenge by underhand means.