This cute little door-mouse is as dead as a doornail.

这个可爱的小老鼠像门钉一样牢固。

youdao

For God sake, I'm gonna be as dead as a doornail in five days.

算啦，我五天后就死翘翘了。

youdao

Without him, we would never eat our flesh and blood out of house and home. We would have to say good riddance to the green-eyed monster and breaking the ice would be as dead as a doornail.

莎士比亚知道引人注目的话语和饼干一样有吸引力，没有他我们从不会吃肉喝血，不会倾家荡产，我们不得不说可喜的摆脱了绿眼怪，打破僵局将会是一命呜呼。

youdao

He was dead as a doornail and while the digital record of his death was hard to find, there was ample evidence in printed books and newspapers that he died and Mark, the chief inheritor of his fortune, knew very well that he was dead.

FORBES: An Internet Carol

The possibility of further deficit spending appears remote, if not dead-as-a-doornail.

FORBES: Get On Board The Gold Train, Next Stop $1,800