Source : Webster's Revised Unabridged Dictionary (1913)

Cacophonic \Cac`o*phon"ic\, Cacophonical \Cac`o*phon"ic*al\,
Cacophonous \Ca*coph"o*nous\, Cacophonious \Cac`o*pho"ni*ous\,
   a.
   Harsh-sounding.

Source : WordNet®

cacophonous
     adj : having an unpleasant sound; "as cacophonous as a henyard"-
           John McCarten [syn: {cacophonic}] [ant: {euphonious}]