The word concupiscent describes a feeling of intense, powerful desire or yearning for someone or something.
This formal word, which means passionate or lustful, comes from the Latin concupere, "to be very desirous of," and its root, cupere, "to long for." Historically, the word was used in theological contexts when referring to worldly human appetites and desires. In literature, it might refer to characters experiencing an all-consuming, urgent desire for each other — think Romeo and Juliet. But someone could have a concupiscent drive or desire for success, money, or even knowledge.