las- / Indo-European roots
To be eager, wanton, or unruly.
a. lust from Old English lust, lust;
b. wanderlust from Old High German lust, desire;
c. list5 from Old English lystan, to please, satisfy a desire, from Germanic denominative verb *lustjan. a-c all from suffixed Germanic zero-grade form *lustuz.
2. Suffixed form *las-ko-. lascivious from Latin lascīvus, wanton, lustful.
[Pokorny las- 654.]