Underhand — Defs

01 a. Secret; clandestine; hence, mean; unfair; fraudulent.

1.
Secret; clandestine; hence, mean; unfair; fraudulent.
2.
Done, as pitching, with the hand lower than the shoulder, or, as bowling, with the hand lower than the elbow.(Baseball, Cricket, etc.)

02 adv. By secret means; in a clandestine manner; hence, by fraud; unfairly; dishonorably.

1.
By secret means; in a clandestine manner; hence, by fraud; unfairly; dishonorably.
“Such mean revenge, committed underhand.” — Dryden.

“Baillie Macwheeble provided Janet, underhand, with meal for their maintenance.” — Sir W. Scott.
2.
In an underhand manner; thrown with the hand no higher than the shoulder and the palm turned upward during part of the pitch; -- said of pitching or bowling a ball.(Baseball, Cricket, etc.)