TBESG:ἐπιθυμητήςone who desiresG:N-M ἐπιθυμητής, -οῦ, ὁ (< ἐπιθυμέω) [in LXX: Num.11:34 (אָוָה hithp.); εἶναι ἐ., Pro.1:22 (חָמַד)* ;] one longing for, lustful after: κακῶν, 1Co.10:6.† (AS)
ἐπιθυμέω epithumeō ep-ee-thoo-meh'-o From G1909 and G2372; to set the heart upon, that is, long for (rightfully or otherwise)KJV Usage: covet, desire, would fain, lust (after).
ἐπιθυμία epithumia ep-ee-thoo-mee'-ah From G1937; a longing (especially for what is forbidden)KJV Usage: concupiscence, desire, lust (after).