Sweetheart adjectives are listed in this post. Each word below can often be found in front of the noun sweetheart in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing SWEETHEART.
dead, first, former
little, lost, new
old, only, own
pretty, real, school
Hope this word list had the adjective used with sweetheart you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.