The most cheerful, lively, or bright in manner or sound; the highest degree of chirpiness.
Superlative form of 'chirpy,' formed with the '-est' suffix (chirpy→chirpiest). This follows the same pattern as 'chirpier,' but the superlative '-est' marks the highest degree rather than comparative '-er.'
Superlatives like 'chirpiest' show why English is so expressive—we have three ways to describe the same quality: chirpy, chirpier, chirpiest, giving us precise tools to say 'this one is the most cheerful of all,' which was important when languages evolved without printing to standardize meaning.
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