How do you say fantastic in hawaiian?

There isn't a direct translation of "fantastic" in Hawaiian that conveys the same exact meaning. However, you can use several phrases depending on the context:

For describing something amazing or impressive:

* Nani loa! (pronounced nah-nee lo-ah) - This literally means "very beautiful" but is often used to express general amazement or admiration.

* Maikaʻi loa! (pronounced my-kah-ee lo-ah) - This means "very good" and can be used to describe something that is excellent or exceptional.

* He maikaʻi loa! (pronounced hey my-kah-ee lo-ah) - This is a more formal way of saying "very good" and is often used to express appreciation for someone's effort or accomplishment.

For describing something that is exciting or thrilling:

* Nani maoli! (pronounced nah-nee mo-o-lee) - This means "truly beautiful" and can be used to express excitement or enthusiasm.

* He ʻoluʻolu loa! (pronounced hey oh-loo-oo-loo lo-ah) - This means "very pleasant" and can be used to describe something enjoyable or exciting.

For describing something that is extraordinary or unique:

* He kupaianaha! (pronounced hey koo-py-ah-nah-ha) - This means "amazing" or "wonderful" and can be used to express awe or wonder.

* He ʻano like ʻole! (pronounced hey ah-no lee-keh oh-leh) - This means "unlike anything else" and can be used to describe something truly unique or special.

Ultimately, the best way to say "fantastic" in Hawaiian will depend on the specific context and the feeling you want to convey.