This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. superlative form of cheery: most cheery.

"A few days before Russia responded to the E coli scare with a heavy-handed bar on all sorts of European vegetable imports, the cheeriest thing America's top trade official could find to say about the Doha round was that he was not ready to read the last rites over its corpse."

stalest    shadiest    absurdest    pleasantest    long-disused