adjective, chirpier, chirpiest.
chirping or tending to chirp: chirpy birds.
cheerful; lively; gay.

1830–40; chirp + -y1

chirpily, adverb
chirpiness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chirpy (ˈtʃɜːpɪ)
adj , chirpier, chirpiest
informal cheerful; lively

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

"cheerfully perky," 1837, from chirp. The notion is perhaps of bird fluttering and chattering.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Many proved similarly chirpy, scoring high on confidence, energy and happiness.
It means surrounding the main characters with lots of chirpy critters wherever
  they go.
They have posters and leaflets and brochures and chirpy enthusiasts who are
  paid to provide that missing willpower.
They are inclusive and informative, but a bit chirpy and somehow bloodless.
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