"Heart-whole" is a term used to describe someone who is completely sincere. If you're looking for similar words to describe this trait, you might consider using adjectives like genuine, authentic, honest, open-hearted, and true. Other related phrases might include "wholehearted," "with all my heart," or "sincere to the core." Essentially, any word that implies honesty and authenticity will work well. If you're trying to describe someone who is kind and loving, you might also use "big-hearted" or "compassionate," though these words don't necessarily convey the same level of sincerity as "heart-whole".