"The next affliction, called lelo in Tibetan, is often translated as 'laziness', but it is much more specific. If a person is working sixteen hours a day, hellbent on earning a whole lot of money with absolutely no concern for virtue, from a Buddhist perspective you could say that person is subject to lelo. A workaholic is clearly not lazy, but such a person is seen as lelo in the sense of being completely lethargic and slothful with regard to the cultivation of virtue and purification of the mind. Our translation of this term is 'spiritual sloth," which we have taken from the Christian tradition, where it is very comparable to the Buddhist notion."
Destructive Emotions, by Daniel Goleman