[miǎo wú yīn xìn]   

渺    无    音    信    指毫无消息。亦作“渺无音讯”。

解释 指毫无消息。亦作“渺无音讯”。

Have never been heard from since

渺不可测    渺无音讯    渺无人烟    渺不足道    渺渺茫茫