* Formal: "The engineer devised a nifty solution to the complex problem."
* Informal: "That's a nifty trick! How did you do that?"
* Descriptive: "The vintage store had a collection of nifty gadgets and trinkets."
* Sarcastic: "That's a nifty excuse for being late."
As you can see, "nifty" can be used in different contexts and with different connotations. It often implies something clever, skillful, or stylish, but can also be used sarcastically.