adjective

involving or producing a harsh, discordant mixture of sounds.

the cacophonous sound of slot machines

loud,noisy,ear-splitting,blaring,booming,thunderous,deafening,raucous,discordant,dissonant,inharmonious,unmelodious,unmusical,tuneless,harsh,strident,screeching,screechy,grating,jarring,jangling,horrisonant,absonant