UNDERHANDING
Verb
underhanding
present participle of underhand
Adjective
underhanding (comparative more underhanding, superlative most underhanding)
Devious; passive-aggressive.
Source: Wiktionary
UNDERHAND
Un"der*hand`, a.
1. Secret; clandestine; hence, mean; unfair; fraudulent. Addison.
2. (Baseball, Cricket, etc.)
Definition: Done, as pitching, with the hand lower than the shoulder, or,
as bowling, with the hand lower than elbow.
Un"der*hand`, adv.
1. By secret means; in a clandestine manner; hence, by fraud;
unfairly.
Such mean revenge, committed underhand. Dryden.
Baillie Macwheeble provided Janet, underhand, with meal for their
maintenance. Sir W. Scott.
2. (Baseball, Cricket, etc.)
Definition: In an underhand manner; -- said of pitching or bowling.
Source: Webster’s Unabridged Dictionary 1913 Edition