As an adjective nifty
is good, smart; a general term for anything that is good, useful or beneficial.
As a noun niftyness is
the state of being nifty.
nifty
English
Adjective
(er)
Good, smart; a general term for anything that is good, useful or beneficial.
niftyness
English
Noun
(niftyness)
The state of being nifty.