Superlative form of glossy: most glossy.(adjective)
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Use "glossiest" in a sentence
"The foliageon this plant is the greenest, glossiest leaf in myentire garden."
"Much of what has been written about Harlem Village Academies, Green Dot and many other charter schools is the product of a massive public relations machine, of which Waiting for "Superman" is just the glossiest example."
"He was also the co-founder, half a century ago, of Rugby World, which remains the game's glossiest monthly bestseller, and for which he commissioned this greenhorn scribbler's first proud pieces all those years ago."