Is as dead a doornail metaphor?

The phrase "as dead as a doornail" is still used today, but it is considered to be somewhat old-fashioned or cliché. It is most often used in informal contexts, such as in conversation or writing between friends or family. The phrase is not considered to be offensive or inappropriate, but it may be seen as outdated or not very creative. If you are looking for a more modern or unusual way to express the idea of something being very dead, you may want to use a different phrase, such as "dead as a dodo" or "dead as a hammer."