Definitions

1. adjective

done or done in a way that is dishonest or unfair, especially in sports or games

“He was accused of using underhand tactics to win the competition.”

2. noun

a ball served or hit in a way that is difficult to reach, especially in tennis

“The opponent struggled to return the underhand serve.”

3. noun

a deceitful or dishonest action, especially one that is intended to deceive or cheat

“His underhand dealings ruined the company’s reputation.”