The opposite of "more aggravating" is "less annoying." When something is less irritating, it means that it has a calming effect on the mind and is less disturbing. In addition, the opposite of "more aggravating" can be "happy," "pleasant," or "enjoyable." Things that make us feel happy, satisfied, or content are generally pleasing to our senses and reduce our anxiety levels. One other antonym for "more aggravating" is "relaxing" because it takes away the stress from our minds and makes us feel comfortable. Therefore, nearly any word that suggests a sense of comfort, relaxation, or happiness can serve as an antonym for "more aggravating.