What is the greek word for unholy?

There isn't one single perfect Greek word for "unholy" as the meaning can depend on context. However, several words could be used depending on the nuance you want to convey:

* ἀνόσιος (anósios): This is probably the closest single word. It means "impious," "ungodly," or "profane," all of which are close to "unholy."

* βέβηλος (bébelos): This means "profane," "unconsecrated," or "unhallowed." It emphasizes the lack of sacredness.

* ἀκάθαρτος (akáthartus): This means "unclean," "impure," or "defiled." This would be appropriate if the "unholiness" is linked to ritual impurity.

The best choice will depend on the specific situation and what aspect of "unholiness" you wish to emphasize.