Formal:
* Kochanie (pronounced koh-HA-nee): This is the most common and versatile term, used for both male and female partners. It translates to "love" or "beloved" and is often used affectionately.
* Moje kochanie (pronounced MOY-eh koh-HA-nee): This means "my darling" or "my love."
Informal:
* Kocham Cię (pronounced KO-ham TCHYE): This means "I love you," and is often used as a term of endearment.
* Słonko (pronounced SWON-koh): This means "little sun" and is a very affectionate term for someone you love.
* Złotko (pronounced ZWOT-koh): This means "little golden one" and is another very affectionate term.
* Skarbie (pronounced SKAR-bee): This means "treasure" and is a sweet and affectionate term.
Other:
* Kochaneczko (pronounced koh-HA-nehch-koh): This is a diminutive form of "kochanie," meaning "little darling," and is used more often for women.
* Misiu (pronounced MI-syoo): This means "little bear" and is often used for someone you love, particularly children or your partner.
The best word to use depends on your relationship with the person, the context of the conversation, and the level of formality you want to convey.