From lept, now usually izlept (“to become spoiled, pampered”), with an extra -n, from Proto-Baltic *lep-, from Proto-Indo-European *lep- (“to bark, to slice, to strip, to split”). The semantic development probably was: “to bark, to strip, to slice” > “(thin) strip, piece (of bark)” > “thin, weak, fragile” > “spoiled, pampered” > “choosy, picky” > “proud, conceited.” Cognates include Lithuanian lepnùs (“fastidious, choosy; weak, fragile; arrogant, proud”), Ancient Greek λεπτός (leptós, “peeled, pared, thin, delicate; weak, sick”) (from Ancient Greek λέπειν (lépein, “to bark, to peel”)), Latin lepidus (“charming, witty; effeminate, pampered”).