Feculent adj. Foul with extraneous or impure substances; abounding with sediment or excrementitious matter; muddy; thick; turbid. "Both his hands most filthy feculent."
... in their clothes. With perfect knowledge of the path, he would step silently through the garden, where flowers run wild had lost their delicacy and grew as monstrous candelabra of coarsened blooms in soil greenly feculent with weeds; she rejoiced in its devastation. He would enter the hall and pick his steps between the pools of wine that lay black on the marble floor; he would tread on the rosettes of corruption that had once been garlands of roses ... — The Judge • Rebecca West