Resembling a rowdy in temper or conduct; characteristic of a rowdy.(adjective)
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Use "rowdyish" in a sentence
"Far more than mature Jerry, was mature Michael playful and rowdyish."
"Amen! went up to heaven in ratification of the deed, mingled with a few hisses and wrathful exclamations from some who were evidently in a rowdyish state of mind, but who were at once cowed by the popular feeling."
"Ralph Touchett wandered away a little, with his usual slouching gait, his hands in his pockets and his little rowdyish terrier at his heels."