The antonyms for the word "most sweet sounding" are diverse and include harsh, grating, cacophonous, discordant, jarring, and unpleasant. When describing sounds, these terms denote qualities that are not pleasing to the ear or that create a sense of discomfort, irritation, or annoyance. While "most sweet sounding" is associated with beautiful and melodious sounds, its antonyms correspond to sounds that are disharmonious, unmelodic, or dissonant. It is essential to understand these antonyms to convey a more accurate description of sounds, such as musical notes, voices, or sound effects, that may not be appealing to everyone's taste.