noun, noun which may take the genitive case particle 'no'
urban villain; street hoodlum
A yojijukugo describing a rough, lawless person from the city streets; somewhat literary and not an everyday word.
He was known as a member of the urban ruffians.
That neighborhood was a hangout for street hoodlums.
無頼漢 is a more common word for a ruffian or rogue, while 市井無頼 specifically emphasizes the urban, streetwise aspect and is a set yojijukugo.
ごろつき is a colloquial term for a thug or hoodlum, whereas 市井無頼 is a literary, four-character compound.
A yojijukugo composed of 市井 (town, streets) and 無頼 (lawless, villainous). The exact historical derivation is uncertain, but it follows a common pattern of combining two two-character compounds to form a set phrase.