underhand
[ˌʌndərˈhænd]
adj.
暗中或秘密进行的，诡诈的;
（球赛时投球）低手的;
adv.
秘密地，不正当地;
（投球时）低手地;
例句:
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It is a sneaky and underhand way of doing business.
这种做生意的方式偷偷摸摸，遮遮掩掩。
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The company will not tolerate coercive and underhand practices.
来自THETIMES
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In softball, pitches are tossed underhand.
垒球运动中采用低手投球。
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Mr Livingstone accused the government of being underhand.
利文斯通先生指责政府搞欺诈。
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Parliamentary leaders were...aware of the underhand nature of their king.
来自A. Fraser
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His Majesty was underhand preparing for war.
来自D. Neal