noun
gang of hoodlums; bad company; delinquent friend
Refers to a group of juvenile delinquents or a friend who is a bad influence. Often used in contexts of youth crime or peer pressure.
彼は不良仲間とつるんで、夜遅くまで遊んでいる。
He hangs out with a gang of hoodlums and stays out late at night.
不良仲間に誘われて、万引きをしてしまった。
I was led astray by bad company and ended up shoplifting.
Compound of 不良 (delinquent, bad) and 仲間 (companion, group). The exact historical derivation is uncertain, but the combination straightforwardly means 'delinquent companion/group'.