IPA: /ˈnɪf.tɪ.li/
KK: /ˈnɪf.tɪ.li/
In a clever and skillful way.
She niftily solved the puzzle that stumped everyone else.
Niftily → It is formed from 'nifty' (originating from the early 19th century, possibly from the word 'nift', meaning clever or skillful) and the suffix '-ly' (meaning in a manner of). The word 'niftily' means in a clever or skillful manner.
Think of 'nifty' as being clever or skillful, and remember that adding '-ly' means in that manner. So, niftily means doing something in a clever way.