The antonyms for the word "more ill sounding" would be "pleasant," "soothing," "melodious," "harmonious," and "tuneful." These words represent sounds that are euphonious, calming, and easy on the ears. They are the opposite of sounds that are harsh, jarring, and grating. The antonyms for "more ill sounding" denote music, speech, or other sounds that evoke an emotionally uplifting response in people. These sounds are likely to have a positive impact on our moods and emotions. So, it can be said that choosing antonyms for "more ill sounding" can help us describe some of the most pleasing sounds we experience in our daily lives.