He faithlessly forsook his friends in their hour of need.在最需要的时刻他背信弃义地抛弃朋友....

adv.不忠实地，靠不住地...

faithlessly的音标：faithlessly的英式发音音标为：['feɪθlɪslɪ]faithlessly的美式发音音标为：['feɪθlɪslɪ]...