1.
Something or someone that is mythical exists only in myths and is therefore imaginary.
...the Hydra, the mythical beast that had seven or more heads.
ADJ: usu ADJ n
2.
If you describe something as mythical, you mean that it is untrue or does not exist.
...the American West, not the mythical, romanticized West of cowboys and gunslingers, but the real West.
ADJ: usu ADJ n