lightly
adv. 轻轻地；轻松地；容易地；不费力地
例句
I touched him lightly on the arm.
我轻轻碰了碰他的手臂。
《牛津词典》
She cuffed him lightly around his head.
她轻轻地在他头上拍了几下。
Someone was tapping lightly at the door.
有人在轻轻敲门。
