This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. One who is loved.

n. Used as a familiar term of endearment.

n. Informal A person regarded as generous or lovable.

n. Informal Something cherished for its excellent qualities.

adj. Involving privileged treatment of a favored party; illegally or unethically favorable: "another land grab, another sweetheart deal based on political influence” ( Village Voice).

n. A person who is always very kind.

n. A person very much liked or loved by someone, especially when both partners are young.

n. A casual sexual partner that is exclusive to the men of one fraternity; a slam piece.

n. A lover of mistress.

n. A person beloved; a lover; more commonly, a girl beloved.

To act the part of a lover to; pay court to; gallant: as, to sweetheart a lady.

To perform the part of a lover; act the gallant; play the wooer: as, he is going a sweethearting.

n. a person loved by another person

n. any well-liked individual

adj. privileged treatment of a favored person or corporation (sometimes unethically)

n. a very attractive or seductive looking woman

"The word sweetheart had given her a sickening feeling."

privileged   

good person    woman    adult female   

lover    ladylove   

sweet    sweetie   

sweetheart deal   

lover    love    flame    Valentine   

chum    darling    Buddy    ma'am    Madam    comrade    playmate    mistress    spouse    pal