The quality or state of being cheerful, lively, bright, or making chirping sounds.
From 'chirpy' + '-ness' (noun suffix). The '-ness' suffix, from Old English 'ness' (state, condition), creates abstract nouns from adjectives, making it one of English's most productive nominalization tools.
English's '-ness' suffix is remarkably productive—you can add it to nearly any adjective to create an abstract noun, which is why English speakers can coin new words like 'hangry-ness' or 'zoom-fatigue-ness' and everyone instantly understands them, even if they're brand new.
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