sneaky
/ˈsniːki/📚 17677 11托福If you describe someone as sneaky, you disapprove of them because they do things secretly rather than openly. 鬼祟的; 偷偷摸摸的
adjective [原级]鬼鬼祟祟的；暗中的，卑鄙的
It is a sneaky and underhand way of doing business. 这是一种偷偷摸摸、见不得人的生意经。
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