tough (Noun) — Someone who learned to fight in the streets rather than being formally trained in the sport of boxing.
tough (Noun) — An aggressive and violent young criminal.
tough (Noun) — An uncultured, aggressive, rude, noisy troublemaker.
tough (Adjective) — Not given to gentleness or sentimentality. ex. "a tough character"
tough (Adjective) — Very difficult; severely testing stamina or resolution. ex. "the competition was tough" ex. "it's a tough life" ex. "it was a tough job"
tough (Adjective) — Physically toughened. ex. "the tough bottoms of his feet"
tough (Adjective) — Substantially made or constructed. ex. "a tough all-weather fabric" ex. "some plastics are as tough as metal"
tough (Adjective) — Violent and lawless. ex. "tough street gangs"
tough (Adjective) — Feeling physical discomfort or pain ('tough' is occasionally used colloquially for 'bad'). ex. "he was feeling tough after a restless night"
tough (Adjective) — Resistant to cutting or chewing.
tough (Adjective) — Unfortunate or hard to bear. ex. "a tough break"
tough (Adjective) — Making great mental demands; hard to comprehend, solve or believe. ex. "a tough problem"