underhand

adj.秘密的,下投的,欺瞒的adv.秘密地,阴险地,(打球时)手不过肩地

秘密的；欺诈的；偷偷摸摸地；

形容词；副词；

1、He accused his opponent of using underhand tactics to win the game.
他指责对手使用不正当手段赢得比赛。
2、She smiled underhand at her friend to signal that they should leave.
她偷偷冲朋友递了个笑脸，示意他们该离开了。