loudly的反义词是silently沉默地，默默地 ，loudly中文意思是adv. 大声地，响亮地

His footsteps echoed loudly in the tiled hall.他的脚步声响亮地回荡在铺着瓷砖的大厅里。

Seagulls followed the boat, crying loudly.海鸥追随着那条船，高声鸣叫着。