The phrase "more plaguing" suggests an increased or intensified degree of something negative or troubling. Some possible antonyms for this might include words such as alleviated, eased, soothed, or relieved. These words suggest a sense of improvement or relaxation, and can be used to describe situations in which a previous source of discomfort has been addressed and remediated. Other possible antonyms might include neutral, balanced, or unremarkable, which suggest a lack of significant impact or influence. Ultimately, the choice of antonym will depend on the particular context and meaning of the original phrase, as well as the goals and tone of the speaker or writer.