toughie

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. an aggressive and violent young criminal
• Syn:
hood, hoodlum, goon, punk, thug,
tough, strong-armer
• Derivationally related forms:
strong-arm (for: strong-armer)
• Hypernyms:
criminal, felon, crook, outlaw, malefactor
• Hyponyms:
bully
2. a particularly difficult or baffling question or problem
• Syn:
poser, stumper, sticker
• Derivationally related forms:
stump (for: stumper), pose (for: poser)
• Hypernyms:
problem