Similar words: rough it, roughing, soughing, coughing, sloughing, ploughing, coughing up, tough. Meaning: ['tʌfɪ] 
n. 1. an aggressive and violent young criminal 2. a particularly difficult or baffling question or problem.
n. 1. an aggressive and violent young criminal 2. a particularly difficult or baffling question or problem. 
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1. That last question was a real toughie.
2. This is a toughie and one that I've struggled with over the years.
3. That's a toughie, sir. If I had to name one thing, I'd have to say that stuff they call porridge we get for breakfast.
4. A rough, violent person who engages in destructive actions: mug, roughneck , rowdy, ruffian, tough. Informal toughie. Slang hood, punk.
5. Gong Li, mainland China's first superstar actress, is a toughie.
6. Brad Miller, for example, is a muscular, powerful player but at the same time, is far from being deemed a toughie by his peers.
More similar words: rough it, roughing, soughing, coughing, sloughing, ploughing, coughing up, tough, burst out laughing, toughen, toughly, tough guy, toughness, toughened, tough luck, a tough nut, tough-minded, well thought out, as tough as old boots, through and through, dante alighieri, laughing, laughingly, laughing gas, laughingstock, no laughing matter, bough, cough, sough, ought.