лени́во • (lenívo)
From ленивый (lenivyй), from Old East Slavic лѣнивꙑи (lěnivyi), from Proto-Slavic *lěnivъ (“lazy, sluggish”), from *lěniti + *ivъ, from *lěniti, from *lěnь / *lěnjь (“laziness”) or *lěnъ (“lazy, slow”).