WordWeb Online

1. (of colour) discoloured by impurities; not bright and clear
   "a muddied white"; "the muddied grey of the sea";
   - dirty, dingy, muddy

1. Dirty with mud
   - muddy up
    
2. Cause to become unclear, confusing or more complicated
   "These data would have muddied the prediction"
    
3. Make turbid
   "muddy the water"

See also: impure

Type of: alter, begrime, bemire [archaic], blur, change, colly [archaic], confuse, dirty, grime, modify, obnubilate, obscure, soil

Encyclopedia: Muddy, Illinois