1. to fail to understand something.

Isabel must have explained her idea three times to me, but I'm afraid I'm none the wiser.

If you take the label off the jar and say you made it yourself, your guests won't be any the wiser.

2. to not be aware of something.

The health department gave the restaurant a health warning, but customers were none the wiser.

Usage notes: often said about efforts to be sure that no one is aware:

I figured I could just get rid of the stuff, and you'd be none the wiser.

• come within an ace of
• come within an ace of doing something
• come within an ace of something
• come within an inch of
• come within an inch of doing something
• come within a whisker of
• come within a whisker of doing something
• come within a whisker of something
• come with the territory
• comings and goings
• commit something to memory
• commit to memory
• commit to memory something
• common ground
• common-or-garden
• common touch
• compare apples and oranges
• compare notes
• conk out
• connect the dots
• contradiction in terms
• contrary to popular belief
• contrary to popular opinion
• conventional wisdom
• conversation piece