Here are some options depending on the context:
Literal translation:
* Poʻo nui: This simply means "big head" and is a neutral description.
* Ke poʻo nui: This translates to "the big head" and is also neutral.
More nuanced options:
* Poʻo ʻā nui: This translates to "big head" but implies a head that is disproportionately large.
* Poʻo puʻu: This means "bump on the head," and could be used to describe a large head or a head with a specific bump.
If you're looking for a phrase that conveys the negative connotation of "big head" in English, you could use:
* ʻIke ʻole i ka pono: This means "doesn't know what's good," implying someone is arrogant or unaware of their shortcomings.
* Manaʻo nui: This means "conceited," implying someone is arrogant or thinks highly of themselves.
Remember: Hawaiian is a nuanced language, and the best translation will depend on the specific context and the intended meaning.