(adv) slyly and secretly; - John Donne; - C.G.Bowers, Syn. underhand, Example:Mean revenge, committed underhand; oldline aristocratic diplomats underhandedly undermined the attempt...to align Germany with the Western democracies
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
2. Insufficiently provided with hands or workers; short-handed; sparsely populated; obsolete in this sense, short-handed or understaffed being the preferrred term. [ 1913 Webster +JG ]
Norway . . . might defy the world, . . . but it is much underhanded now. Coleridge. [ 1913 Webster ]