The phrase "more jangling" refers to something that is noisy or irritating, so its antonyms would be words that describe things that are quiet, soothing, or calming. Some possible antonyms for "more jangling" could include peaceful, serene, tranquil, quiet, harmonious, melodic, mellow, and soothing. These words are often used to describe environments or experiences that provide a sense of relaxation or tranquility, such as a soft melody or a peaceful natural setting. Using antonyms for "more jangling" can help to convey a different mood or atmosphere in writing, by emphasizing a sense of calmness or harmony rather than noise or chaos.