The phrase "of this world" refers to something that is earthly or mundane. Some synonyms for "of this world" include worldly, temporal, mundane, secular, and earthly. These words describe things that are tangible, physical, and material. They refer to things that can be seen, touched, or experienced through the senses. However, they imply a sense of transience as well, suggesting that these things are temporary and will eventually pass away. These synonyms provide an interesting perspective on the things that matter most to us and remind us that we should focus on eternal things rather than on temporal concerns.