1 dirty, stain, begrime, muddy, smear, spot:
His shirts were returned by the laundry still soiled.
2 pollute, contaminate, sully, defile, foul, befoul, tarnish, besmirch, disgrace, muddy, smear, blacken; blot:
The scandal soiled his previously spotless reputation.
3 dirt, filth, muck, mire, mud, sludge, dregs, refuse; excrement, waste (matter):
The soil is carried away by these pipes into the main sewer.
earth, loam, dirt, ground, turf, humus; clay:
The men who dug the swimming-pool took away the soil from the pit.