stagnant
/ˈstægnənt; `stæɡnənt/ adj
1 (of water) not flowing and therefore dirty and smelling unpleasant; still and stale （指水）因不流动而污浊、 腐臭的, 静止而不新鲜的
water lying stagnant in ponds and ditches 池塘和沟中的死水.
2 (fig 比喻) showing no activity (and therefore not developing or progressing); sluggish 停滞的; 不景气的
Business was stagnant last month. 上个月生意萧条.