The phrase "is one ears in" means to be attentive, alert, and fully engaged in a conversation or situation. There are numerous synonyms for this phrase, including "fully focused," "paying attention," "tuned in," "attentive," "engaged," "alert," "absorbed," "attentive," "concentrated," "riveted," "intent," "absorbed," "fixated" and "involved." These synonyms capture the essence of the phrase, which is all about being present and fully focused in the moment. By using these synonyms, you can convey a sense of attentiveness and intensity that will help you connect with those around you in a more meaningful way.