The word "sweetsounding" refers to something that is pleasant to hear or has a pleasing musical quality. Its antonyms, or opposite words, would include jarring, grating, unpleasant, and dissonant. These words describe sounds that may be harsh or harsh-sounding, irritating or annoying, or simply lack the pleasing quality of sweet-sounding. Other antonyms for "sweetsounding" may include discordant, off-key, discordant, or shrill, indicating an unpleasant or unpleasant sound quality. While there are many ways to describe sounds that are not sweet-sounding, these antonyms suggest that such sounds may be unpleasant or even intolerable to the ear.