Superlative form of quirky: most quirky.(adjective)
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Use "quirkiest" in a sentence
"Rosaries, coffee mugs, bumper stickers, and then, what the gift shop manager calls his quirkiest item, a tour t-shirt."
"Rosaries, coffee mugs, bumper stickers, and then what the gift shop manager calls his quirkiest item, a tour T-shirt."
"Three pairs of candidates are vying to be on the November ballot for the statewide office one politician described as Vermont's "quirkiest:" lieutenant governor."