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.

"look im sorry i ate your food"
"is cool im just lil mad"

Although humans possess the necessary critical thinking and problem-solving skills to alter the ever so grim fate of the planet, they dissent in denial and refusal from the dark complacent well of apathy unto the destruction of the planet.

If being bitter and complacent is what it means to grow up, then let me stay immature forever.

I'd rather not be complacent