The phrase "looking on" can have different meanings when used in various contexts. It could mean observing, watching, gazing, staring, peering or examining. In a social context, "looking on" could denote a state of being a passive spectator to an event or action. It could also imply an interested onlooker, someone who is watching with an intent to learn or understand. In a more emotional context, "looking on" could be used to describe a feeling of longing or yearning. Regardless of its usage, there are several effective synonyms that can convey the same meaning, and using them can help to add texture and variety to one's writing.