One who cuts throats; a ruffian who murders or does deeds of violence; a murderer or assassin by profession.

A large clenched fist that can deal a heavy blow; hence, a rough, brutal fellow.

A person who disturbs or interrupts another's peace, rest, etc., or who intrudes upon another's privacy. Also: a person who commits violence against…

one who applies physical force.

A violent or aggressive person, esp. a criminal; a hoodlum.

A person who subjects another to outrage or gross violence; a violator; an affronter or offender of other people, their feelings, laws, morals, etc.

colloquial. Irish English and U.S. A troublemaker, a thug.