The kid was complacent with his small little trouble
free world.
The hippies and lazy teenagers were complacent, complaining but never doing anything about it, never realizing they were part of the problem.
The complacent
protestor held up a sign and screamed chants, complaining a lot, but never took any positive action to make a change.
The old guy became complacent and got a bunch of diseases because he didn't take care of himself, lacking the motivation to do anything with his
waning years.