Confused means not knowing what's going on or feeling mixed up about something.
When people say they're confused, it usually means they don't understand something. It can be because someone explained it poorly, they didn't pay attention to the details, or maybe they just learned a lot of new stuff and their brain is still trying to make sense of it all. If you ask someone what's wrong, they might say "I'm just really confused about this assignment" meaning they don't know how to do it.
To puzzle, perplex, baffle, bewilder (somebody).
(of a person) unable to think clearly or understand
