be none the wiser

Meaning

1. 1

   to not understand sth, even after it has been explained to you

   I've read the instructions, but I'm still none the wiser.

2. 2

   to not know or find out about sth bad that sb has done

   If you put the money back, no one will be any the wiser.

In the movies · 1

• and we get out, leaving them none the wiser.Captain Marvel2019
• lt's a big mystery. None of the wise men could tell me what it means.Spaceballs1987
• I never use it, so there I am pretending to dial a number and taking Smith's picture, him none the wiser.Lucky Number Slevin2006

From the same entry

• be wise after the event
• be wise to
• put wise
• wise up