What is the greek word for mythical?

There isn't one single perfect Greek word that translates to "mythical" in the sense of relating to myths. The best choice depends on the nuance you want to convey. Here are a few options and their subtle differences:

* μυθικός (mythikós): This is the most straightforward adjective derived from "μῦθος" (mythos), meaning myth or story. It literally means "of or pertaining to myths." This is probably the closest single-word equivalent.

* μυθώδης (mythōdēs): This word implies something *like* a myth, or having the characteristics of a myth – perhaps something legendary or fantastical, even if not strictly a myth.

The best word to use depends on the context. If you're talking about something clearly from a myth, μυθικός is best. If you're describing something that *resembles* a myth in its fantastic nature, μυθώδης might be more appropriate.