[nif-tee] Informal.
adjective, niftier, niftiest.
attractively stylish or smart: a nifty new dress for Easter.
very good; fine; excellent: a nifty idea.
substantial; sizable: We sold the car for a nifty profit.
noun, plural nifties.
something nifty, as a clever remark or joke.

1860–65, Americanism; of obscure origin

niftily, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nifty (ˈnɪftɪ)
adj , -tier, -tiest
1.  pleasing, apt, or stylish
2.  quick, agile: he's nifty on his feet
[C19: of uncertain origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1868, perhaps theatrical slang, first attested in a poem by Bret Harte, who said it was a shortened, altered form of magnificat (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

nifty definition

  1. mod.
    neat; smart. : That is a pretty nifty car you have there.
  2. n.
    a fifty-dollar bill. (From nifty-fifty.) : He paid me with a nifty and a domino.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
Many of you certainly use some nifty tools on your computer desktops.
Waiting in the wings are some nifty ideas for applying ink-jet knowhow to
  commercial printing.
Thirty crucial skills, nifty tips, and shameless shortcuts to improving your
If evolution has a top-ten list of nifty innovations, then complex social
  behavior is sure to be on it.
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