Focusing on a task or subject can sometimes be difficult and requires significant concentration. However, when searching for synonyms that convey the notion of being highly attentive or absorbed in a matter, some phrases can help. For instance, "engrossed in" implies that someone is so engrossed in a matter that they have absorbed the entirety of their attention and cannot be swayed by external distractions. Similarly, "dedicated to" can suggest a commitment or sincere interest in a project or task. "Immersed in," "fixated," "attentive to," and "preoccupied with" are other synonyms that can convey the idea of extreme concentration and focus. Overall, the key to using these synonyms is to capture the spirit of being productive, focused, and dedicated.