chirpiness       
noun [ U ] UK uk/ˈtʃɜː.pi.nəs/ us/ˈtʃɝː.pi.nəs/
 快乐;活泼;轻松愉快
the quality of being happy and energetic
  For all her bright-eyed chirpiness, she is no fool.  她眼睛亮亮、活泼快乐,但并不好骗。 
 He has the false chirpiness of a radio talk-show host. 他有一种电台脱口秀主持人的轻松俏皮。 
 See: chirpy
 - More examples
 - These books project a sort of self-help chirpiness.
 - The chirpiness of his tone belied his real feelings.
 - There was an impressive chirpiness to the way they resumed their business without complaint.