[adv] with the hand swung below shoulder level'; "throwing a ball underarm"
[adv] slyly and secretly; "Mean revenge, committed underhand"- John Donne; "oldline aristocratic diplomats underhandedly undermined the attempt...to align Germany with the Western democracies"- C.G.Bowers
[adj] marked by deception; "achieved success in business only by underhand methods"
[adj] (sports) with hand brought forward and up from below shoulder level; "an underhand pitch"; "an underhand stroke"