If you say that someone is none the wiser after an event or an explanation, or that nobody is any the wiser after it, you mean that they have failed to understand it, or are not fully aware of what happened.

What does be none the wiser mean?

1 : not knowing or understanding anything more about something The investigation has been going on for months, and we're still none the wiser about the true cause of the accident.

How do you use none the wiser?

1) I was none the wiser after his explanation. 2) Even after listening to his explanation I'm none the wiser. 3) I've read the instructions, but I'm still none the wiser. 4) I've read the instructions twice and I'm still none the wiser.