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1·In softball, pitches are tossed underhand.

垒球运动中投球均是低手式投。《柯林斯英汉双解大词典》

2·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。《柯林斯英汉双解大词典》

3·I would never have expected her to behave in such an underhand way.

我从未想到她的行为竟如此阴险。《牛津词典》

4·It is obscure because it is underhand.

它不公开，因为它是在地下进行的。

5·A secret or underhand scheme; a plot.

阴谋，密谋秘密的或不光彩的计划；密谋。

6·An honest man does nothing underhand.

明人不做暗事。

7·To deceive by sly or underhand means;

用秘密的、不正大光明的手段骗取；

8·Ball may be served underhand or overhand.

发球有上手发球和下手发球两种。

9·An honest man doesn't do anything underhand.

诚实的人不做偷偷摸摸的事情。

10·Maybe I can understand WHY you acted underhand.

也许我能理解，你为何如此躲躲藏藏。

阴险的

1·Most managers who find themselves in charge of someone they can't stand engage in something more underhand.

当发现自己手下有个自己无法容忍的下属时，大多数经理人会使出一些更阴险的手段。

2·Thus, when underhand manoeuvres threaten complications, you confront the issues or individuals involved swiftly and with authority.

所以，当阴险的手段使周边的威胁更复杂化时，你更要拿出权威面对相关的人与事。

狡诈的

1·These verbs mean to lead another into error, danger, or a disadvantageous position, for the most part by underhand means.

这动词是通过狡诈的手段把他人导入错误、危险或不利的位置的意思。