Antonyms for the phrase "be immersed" include to be detached, disengaged, uninvolved, and superficial. When one is detached, they have no emotional investment or attachment to a particular subject or activity. Disengaged, on the other hand, refers to a lack of involvement or connection to one's surroundings. Uninvolved suggests a complete lack of involvement or interest in a particular subject or activity, while superficial emphasizes a lack of depth or seriousness. These antonyms oppose the state of being fully engaged, absorbed, or immersed in an activity or subject, highlighting the absence of emotional and intellectual investment.