adv.无声地；完全静寂地；静悄悄地

He walks slowly and soundlessly like a leopard. 他象一只豹子一样缓慢无声地走着。

I cried soundlessly in night that day. 那天夜里我无声地哭了。

I counted ten in all, gliding almost soundlessly through the bleak white glare. 一共有十来个，静悄悄地在这耀眼的灯光中挪动。