The term 'female sweetheart' can be summarized by two crossword solutions: INAMORATA (9 letters) and LASS (4 letters). INAMORATA is an Italian word derived from the Latin phrase 'in amore, ' which translates to 'in love.' It is used to refer to a woman who is deeply in love with someone. LASS is a Scottish term for a young woman or girl, often used to refer to a young woman who is beloved by someone. Both terms are used to describe a female sweetheart.