Etymology
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rowdy (n.)

"a rough, quarrelsome person," 1808, originally "lawless backwoodsman," "Of American, but otherwise quite obscure, origin" [OED]. Perhaps from row (n.2) "noisy commotion" (itself of uncertain origin). The adjective, "having the manners of or conducting oneself like a rowdy, rough and noisy," is attested by 1819. Related: Rowdily; rowdiness; rowdyism.

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Definitions of rowdy
1
rowdy (n.)
a cruel and brutal fellow;
Synonyms: bully / tough / hooligan / ruffian / roughneck / yob / yobo / yobbo
2
rowdy (adj.)
disturbing the public peace; loud and rough;
rowdy teenagers
Synonyms: raucous
From wordnet.princeton.edu