Stagnant water is a term used to describe water that is not flowing or circulating. It can often be found in ponds, swamps, and other bodies of water that receive little to no circulation. There are many synonyms for stagnant water, including still water, standing water, motionless water, and stagnant liquid. Other terms that can be used to describe stagnant water include dead water, fetid water, and putrid water. Regardless of the term used, stagnant water can be harmful to both humans and wildlife, as it can become a breeding ground for insects and parasites, as well as bacteria and other microorganisms. It is important to take measures to prevent the buildup of stagnant water to ensure a healthy environment.