The phrase "is in love with" has various alternative synonyms, such as "adore," "cherish," "treasure," "devote," "worship," "idolize," "yearn for," "crave," "desire," "covet," "enamored," "enchanted," and "infatuated." These words are all expressions of deep affection, adoration, and passionate attachment to someone or something. The choice of synonym will depend on the intensity and nature of the feeling involved, whether it is romantic, platonic, or familial. Regardless, it is an expression of deep emotional attachment, and the words used convey the intensity and depth of the feeling being expressed.