Superlative form of rowdy: most rowdy. (adjective)
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Use "rowdiest" in a sentence
"10 Kansas State, are expecting perhaps their largest crowd of the season on Wednesday, including Perry, who has season tickets near the top of the arena that public-address announcer Larry Reece has informally dubbed the rowdiest in the nation."
""Hansen's Rush" was one of the richest, noisiest, and the "rowdiest" of all the many newly-discovered fields, and contained more of the elements of villainy amongst its six hundred inhabitants than any other rush in the Australian Colonies."
"After Casey performed her Dolly Parton-esque "I Will Always Love You," he got up to talk to the folks in the pit, the rowdiest group in the house."