Procrastination was also the golden mediator that first came to my mind: we like to put off and put off and put off what we are not intrinsically motivated to do. We are not too lazy to do it, we just lack motivating reasons ;-)) This being "lazy" is more of a general state, complete lack of drive, contentment with being stuck....
Prokrastination war auch der goldene Mittler, der mir als erstes einfiel: wir schieben gerne auf und auf und aufer, wozu wir nicht intrinsisch motiviert sind. Wir sind nicht zu faul dazu, uns fehlen nur motivierende Gründe ;-)) Dieses "faul" sein ist mehr so ein allgemeiner Zustand, komplette Antriebslosigkeit, Zufriedenheit mit dem Verharren...
@chriddi mentioned procrastination too and I found it interesting that the first article included procrastination under "lazy". But I don't consider procrastination as lazy - it's not a lack of willingness, it's a lack of wanting so like you say "not intrinsically motivated to do". Or maybe they're the same thing.
To me, this says that it's more to do with "energy". We're generally lazy when we never have the energy to do anything. If we've got the energy but simply don't want to, then maybe we're unmotivated.
The more I think about it, the more I think that the first article I referenced is a load of crap.