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

• Lexulous
• Wordscraper
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adj. superlative form of perky: most perky.

"The background: If you find Kylie's almost relentless determination to be the perkiest pop girl on the planet – and at the age of 42, no less – a tad wearying, then you need Rosanna, who sounds as though she's permamently in the throes of an existential crisis, and is only 22."