The phrase "glued to" is often used to describe someone who is completely engrossed or captivated by something. However, there are several other synonyms that can be used to convey a similar meaning. For example, you could say that someone is "fixated on," "obsessed with," or "mesmerized by" something. Alternately, you might describe someone as being "riveted," "enthralled," or "spellbound" by a particular experience or activity. Whether you're describing a person who is deeply engaged in a movie, book, or conversation, there are many different words you can use to capture the sense of being "glued to" something.