1. (noun) an aggressive and violent young criminal

• goon
• hood
• hoodlum
• punk
• strong-armer
• thug
• tough

2. (noun) a particularly difficult or baffling question or problem

• poser
• sticker
• stumper

1. (noun) an aggressive and violent young criminal

• bully

1. (noun) an aggressive and violent young criminal

• criminal
• crook
• felon
• malefactor
• outlaw

2. (noun) a particularly difficult or baffling question or problem

• problem

1. (noun) an aggressive and violent young criminal

• strong-arm
• strong-arm

2. (noun) a particularly difficult or baffling question or problem

• amaze
• baffle
• beat
• bewilder
• dumbfound
• flummox
• get
• gravel
• mystify
• nonplus
• perplex
• pose
• puzzle
• stick
• stupefy
• vex
• mix up
• stump