Underhand

1. adv. In an underhand manner; — said of pitching or bowling.
2. a. Secret; clandestine; hence, mean; unfair; fraudulent.
3. a. Done, as pitching, with the hand lower than the shoulder, or, as bowling, with the hand lower than elbow.
4. adv. By secret means; in a clandestine manner; hence, by fraud; unfairly.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.