sweetheart

/ˈswiːthɑːrt/
noun
  1. A person with whom one is in a romantic relationship; a boyfriend, girlfriend, or lover.
    • She met her sweetheart in college, and they've been together ever since.
    • He brought flowers for his sweetheart on Valentine's Day.
    • My sweetheart and I are planning a trip to the beach.
  2. A kind, generous, or lovable person (often used as a term of endearment).
    • Don't worry, sweetheart, everything will be fine.
    • Thanks for helping me move, you're a real sweetheart.
    • My grandmother is a sweetheart who always bakes cookies for the neighbors.
Antonyms
adjective
  1. Relating to or characteristic of a romantic partner or relationship.
    • She wore a sweetheart necklace he had given her.
    • The movie is a sweetheart story about two childhood friends.
    • They had a sweetheart deal where they shared all their profits.