For a romantic partner:
* Mon cœur: This is the most direct translation, meaning "my heart." It's very affectionate and formal.
* Mon chéri/ma chérie: This translates to "my darling" and is also a very romantic term.
* Mon amour: This means "my love" and is a more general term of endearment.
* Ma belle: This means "my beautiful" and is used for someone you find attractive.
For a friend or family member:
* Mon ami/mamie: This means "my friend" and is a casual term of endearment.
* Mon cher/ma chère: This translates to "my dear" and is more formal than "mon ami/mamie."
* Mon trésor: This means "my treasure" and is a very affectionate term.
It's also common to use diminutives like mon petit/ma petite ("my little one") or mon chou/ma chou ("my cabbage") as terms of endearment.
Ultimately, the best way to say "sweetheart" in Cajun French depends on your relationship with the person and the specific tone you want to convey.