{s} lacking the key to solving a problem, without a hint; being totally unaware, being naive, being innocent and unsuspecting
totally uninformed about what is going on; not having even a clue from which to infer what is occurring
disapproval If you describe someone as clueless, you are showing your disapproval of the fact that they do not know anything about a particular subject or that they are incapable of doing a particular thing properly. I came into adult life clueless about a lot of things that most people take for granted. having no understanding or knowledge of something - used to show disapproval clueless about