/un"deuhr hand'/ , adj.
1. not open and aboveboard; secret and crafty or dishonorable: an underhand deal with the chief of police.
2. executed with the hand below the level of the shoulder and the palm turned upward and forward: an underhand delivery of a ball.
adv.
3. with the hand below the level of the shoulder and the palm turned upward and forward: to bowl underhand.
4. secretly; stealthily; slyly.
[ bef. 900; 1530-40 for def. 1; ME under hande (adv.) under rule, OE underhand. See UNDER-, HAND ]
Syn. 1. stealthy, sly, clandestine, surreptitious.