1.
punk, thug, hoodlum
A young, low-ranking delinquent or petty criminal. Often implies someone who acts tough or intimidating but is not a serious organized crime figure.
Usage
チンピラ implies a low-level troublemaker, not a serious criminal or organized crime member. It carries a sense of petty intimidation — someone who picks fights, harasses passersby, or acts menacingly. The word is often used dismissively.
Register
Informal and somewhat rough. Using this word to describe someone is insulting.