When you want to describe that somebody has adequate knowledge or understanding about a particular topic, you can use many synonyms for "informed about." These include well-versed, up-to-date, knowledgeable, acquainted, familiar with, conversant, aware of, cognizant of, well-read, well-informed, briefed, educated, abreast of, clued-in, compassed, enlightened, in the know, versed, and wise to. Each of these synonyms carries its own nuances, providing you with various options to describe the level and depth of knowledge that someone possesses on a given subject matter. By using the appropriate synonym, you can paint a rich and nuanced picture of somebody's understanding and expertise.