Underhanded a. : Underhand; clandestine.

Underhanded a. : Insufficiently provided with hands or workers; short-handed; sparsely populated.

Example:
Is it legal to throw a baseball Underhanded when you pitch?

Taxonomy
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Defination from the web:
underhanded from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "underhanded" Learn more about "underhanded" and related topics at Britannica.com. Pronunciation Symbols. Share this entry: ...