Word that means bad sounding
Solution 1:
discordant -
disagreeable to the ear; dissonant; harsh.
dissonant was my first thought, but it's not as apt as discordant for your example. I think of dissonant as something that's off, not something that's just jarring to the ear.
You have to be careful to distinguish this use of the word from the more common meaning of being in disagreement.