REFL is an informal abbreviation for reflection, which is the act of thinking about or considering something deeply. When searching for synonyms for the term REFL, several options come to mind. One could use words like contemplation, pondering, introspection, or meditation. Another similar term could be self-examination, which is the process of looking inward to understand one's thoughts, emotions, values, or behaviors. Some other words that convey the idea of reflecting or thinking deeply include musing, brooding, ruminating, deliberating, and cogitating. Ultimately, the choice of synonym for REFL would depend on the context and purpose of the communication.