The Collaborative International Dictionary of English v.0.48:

Foul \Foul\, v. t. [imp. & p. p. Fouled; p. pr. & vb. n.
   Fouling.]
   1. To make filthy; to defile; to daub; to dirty; to soil; as,
      to foul the face or hands with mire.
      [1913 Webster]

   2. (Mil.) To incrust (the bore of a gun) with burnt powder in
      the process of firing.
      [1913 Webster]

   3. To cover (a ship's bottom) with anything that impered its
      sailing; as, a bottom fouled with barnacles.
      [1913 Webster]

   4. To entangle, so as to impede motion; as, to foul a rope or
      cable in paying it out; to come into collision with; as,
      one boat fouled the other in a race.
      [1913 Webster]

WordNet (r) 3.0 (2006):

fouled
    adj 1: made dirty or foul; "a building befouled with soot";
           "breathing air fouled and darkened with factory soot"
           [syn: befouled, fouled]
    2: especially of a ship's lines etc; "with its sails afoul"; "a
       foul anchor" [syn: afoul(ip), foul, fouled]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "fouled":
   bedraggled, befouled, besmirched, blocked, bound, choked,
   choked up, clogged, clogged up, congested, constipated, costive,
   defiled, dirtied, drabbled, draggled, foul, full, infarcted,
   jammed, obstipated, obstructed, packed, plugged, plugged up,
   smirched, smudged, soiled, spotted, stained, stopped, stopped up,
   stuffed, stuffed up, sullied, tainted, tarnished