stagnant
adjective uk/ˈstæɡ.nənt/ us/ˈstæɡ.nənt/
(NOT FLOWING)
（水或空气）不流动的，污浊的
(of water or air) not flowing or moving, and smelling unpleasant
a stagnant pond 死水塘
(NOT BUSY)
停滞的，不发展的
not growing or developing
a stagnant economy 停滞的经济