have never been heard of since not heard from ... at all completely not heard from No answer was heard of
For weeks there was no reply.
过了好几个星期,一直杳无音信。
—— 辞典例句His mother is disquieted that she has received no letter from him for 4 months.
4个月了,儿子杳无音信,做母亲的很担心。
—— 辞典例句Several days passed and still there was no news of him.
几天过去了,他还杳无音信。
—— 给力词典精选As the months went by, still no letter arrived.
几个月过去了仍杳无音信。
—— 给力词典精选We haven´t heard from them to date.
到目前为止,他们杳无音信。
—— 给力词典精选