Superlative form of cheery; the most bright, happy, and optimistic.
'Cheery' plus the superlative suffix '-est,' forming the strongest degree of this adjective. This is the standard modern formation for one-syllable or short adjectives in English.
Superlatives like 'cheeriest' are psychologically powerful in advertising and language—our brains latch onto 'the best' or 'the cheeriest,' which is why marketing loves superlatives even though they're often meaningless claims.
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