* ʻĀnuenue: This is the most common and literal translation, referring to the "multicolored arch." It's the most poetic and beautiful way to express it.
* Kāhili o ka lani: This literally translates to "banner of the sky," and is a more descriptive way to refer to a rainbow.
* Ka ua lihilihi: This literally translates to "the shimmering rain" and is a more poetic way to describe a rainbow, referencing the way it appears after rain.
Ultimately, the best way to say "rainbow" in Hawaiian depends on the context and the desired level of formality.