Her underhand relationship with her neighbor was discovered by her husband.

她和邻居之间偷偷摸摸的关系被丈夫发现了。

Player number one scored the crucial point with an underhand throwing.

一号选手用低手投球得到了这关键的一分。

Our agents are conducting underhand operations at the enemy base.

我们的特工正在敌人基地进行秘密的行动。

In softball, pitches are tossed underhand.

垒球运动中投球均是低手式投。

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。

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。

It is obscure because it is underhand.

它不公开，因为它是在地下进行的。

A secret or underhand scheme; a plot.

阴谋，密谋秘密的或不光彩的计划；密谋。