underhand

1. ADJ If an action is underhand or if it is done in an underhand way, it is done secretly and dishonestly. 秘密的; 不诚实的[usu ADJ n] [表不满]

...underhand financial deals. …秘密的金融交易。

...a list of the underhanded ways in which their influence operates in the United States. …他们的势力在美国运作的一系列不正当手段。

2. ADJ You use underhand or underhanded to describe actions, such as throwing a ball, in which you do not raise your arm above your shoulder. (投球等) 低手的 (指手不过肩)[美国英语] [ADJ n]

...an underhand pitch. …一次低手投球。

3. ADV Underhand is also an adverb. 低手地[ADV after v]

In softball, pitches are tossed underhand. 垒球运动中投球均是低手式投。