Superlative form of swanky: most swanky.(adjective)
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Use "swankiest" in a sentence
"It's by far the swankiest office shower room I've ever been in."
"The Super Bowl is a television show and the fact nearby Manhattan can throw the swankiest events ever has little bearing on life."
"This June, the hotel unveiled what might be the swankiest spa in London: a four-story, 35,500 square foot flagship ESPA Life spa featuring a silver steel swimming pool, an amphitheater sauna, a black mosaic steam room, a Daniel Galvin hair salon, and a state-of-the-art gym."