Like still water in a pond. The pond develops mosquitoes unlike a river that flows and refreshes. Or the current state of Congress in that they talk a lot but get little done.
A prolonged period of little or no growth in an economy.
Stagnate.
i am a stagnate
Fester, idle, and hibernate are words. Those mean stagnate.
The term "stagnate" means not flowing or moving, motionless. It can also mean foul or stale from standing. Words with similar meaning include sluggish, dull from inaction, etc.
Stagnation usually refers to the state of water when it is not flowing
Once the stream was diverted the pond was deprived of its inflow of fresh water and rapidly began to stagnate.
Websites will get cooler and better for a while and then stagnate because sometimes their owners lose interest in a project. Other times websites will stagnate because people lose interest in the site.
Stagnate
After 10 days in the dank basement, the water had gone stagnante
Stale bread and stagnate water.
removed stagnate water
Stagnation usually refers to the state of water when it is not flowing