Definition of chirpiness in US English:

chirpiness

noun

informal
  • See chirpy

    • ‘Well-known for his ready smile and chirpiness, Brian, from Lymington, said: ‘We are a very close-knit team and we try to make things fun for obvious reasons.’’
    • ‘It is her chirpiness that makes her so popular.’
    • ‘‘What me and Mr Romanov speak about has nothing to do with you,’ said Rix when this was mentioned, his wearing chirpiness vanishing at the hint of being asked something demanding.’
    • ‘But even her critics, infuriated by her indomitable chirpiness, admire her equally unquenchable energy.’
    • ‘I've hidden it as best I can when I've stayed at his place, or when we've been away together, but his chirpiness drives me nuts, and there's no way I could keep up the façade full-time.’

Pronunciation

chirpiness

/ˈCHərpēnəs//ˈtʃərpinəs/