However, here are some options you could use to express that sentiment:
Using "mau" (always)
* Mau pono: This literally means "always right" or "always good," but can also be used to convey "always faithful."
* Mau aloha: This literally means "always love," but could be interpreted as "always loyal" or "always faithful."
Using "ʻoiaʻiʻo" (truth)
* ʻoiaʻiʻo mau: This means "true always" and can be used to express unwavering faithfulness.
Using "makaʻu" (fear) in a positive sense
* Makaʻu i ke Akua: This means "fear of God," but can also be interpreted as "faithful to God." This would be particularly appropriate in a religious context.
Using a phrase that captures the idea of faithfulness
* Ku pono: This means "standing right" and can be used to express steadfastness and loyalty.
* Nā pōmaikaʻi: This means "blessings" and can be used to express loyalty and faithfulness in a relationship.
Ultimately, the best way to convey "always faithful" in Hawaiian depends on the specific context and the tone you want to create.