adjective, perkier, perkiest.
jaunty; cheerful; brisk; pert.

1850–55; perk1 + -y1

perkily, adverb
perkiness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
perky (ˈpɜːkɪ)
adj , perkier, perkiest
1.  jaunty; lively
2.  confident; spirited

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

1820, from perk. Of young women's breasts since at least 1937.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Since his medical details are a state secret, the rest of the world can only
  guess whether his health is as perky.
It didn't help that the preternaturally perky grad students didn't much care.
Turns out, those little guys can stay fresh and perky for quite a while stored
  unplucked in a plastic bag in the fridge.
Unfortunately, such figures rely on overseas customers feeling perky.
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