none the wiser

idiom

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.

2

—used to describe someone who is not at all aware of something that has happened

I borrowed his car and returned it, and he was none the wiser.

Video

Is 'None' Singular or Plural?

Or both? Or neither?