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Lumisky is an adjective meaning "as bright as the shining sky", derived from "Lumi" - the luminescence of light, or more specifically, sunlight - and "sky" - denoting the sky, specifically the bright day sky when the sun is out. To describe one as lumisky would be to compare them to the brightness of the sun, usually meaning they're bright (intelligent and quick-witted) or charming (pleasant or attractive) or energetic (showing or involving great activity).
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