ἐπιθυμία
epithymía · word · “desire, lust, longing”
Epithymia means strong desire — sometimes a good longing, but more often the disordered desires Paul calls the works of the flesh.
Epithymia is the verb for what the heart reaches toward. It is morally neutral on its own — Jesus longs (epethymēsa) to eat the Passover with his disciples.
But in Paul it most often names disordered desire — the cravings of the flesh that war against the Spirit and must be put to death by the Spirit.
Definition: a longing (especially for what is forbidden)
KJV usage: concupiscence, desire, lust (after)
Reference gloss from Strong's Concordance (1890, public domain).
Original BibleDawn word study. Original-language data and the public-domain Strong's (1890) gloss are referenced; see sources.