What is the meaning of 'nifty'?

"Nifty" can mean:

1: attractively stylish or smart

(ex): That's a nifty dress.

2: very good

(ex): He had a nifty idea!

3: sizeable

(ex): We sold the car for a nifty profit.

4: clever

(ex): I'm nifty.

Nify means neat!, swell, neat-o. It's a fun, slangy Word. Use it as you would "cool!"