The investigation has been going on for months, and we're still 'none the wiser' about the true cause of the accident. [=we still don't know anything more about the true cause]
I'm 'wise to' you. = I'm 'wise to' what you're doing. [=I know what you're doing; I know that you are trying to do something dishonest]
I borrowed his car and returned it, and he was 'none the wiser'. [=he did not know that I had borrowed his car]
(..) COWARD!!! Potter? I know that many of you will want to fight. Some of you may even think that to fight is wise. Give me Harry Potter, and I shall leave Hogwarts untouched. Give me Harry Potter, and you will be rewarded. What're you waiting for? (..)2011 Harry Potter and the Deathly Hallows: Part 2
(..) of Dragons. Show your strength. No one's seen Drogon in weeks. For all I know, he's flown halfway across the world. The wise masters ask for the reopening of the fighting pit. Where slaves fought slaves to the death? Opening them would show the people of Meereen that you respect their traditions. (..)2015 TvShow: Game of Thrones Title: Kill the Boy Season: 5 Episode 5
(..) I make a point of avoiding familiarity with pirates. It would be a shame to put a mark on your record. So if you'll excuse me. Do you think this wise, boy? Crossing blades with a pirate? You threatened Miss Swann. Only a little. You know what you're doing. I'll give you that. Excellent form. (..)2003 Pirates of the Caribbean: The Curse of the Black Pearl