UNDERHAND Meaning of UNDERHAND in English adj. & adv.adj. 1 secret, clandestine, not above-board. 2 deceptive, crafty. 3 Sport, esp. Cricket underarm. adv. in an underhand manner. [ OE (as UNDER-, HAND) ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012