Synonym: complicated, difficult, durable, firm, hard, hardy, obscure, strong, sturdy, unclear, vague. Antonym: tender. Similar words: toughness, dough, though, enough, through, drought, ought to, roughly. Meaning: [tʌf] 
n. 1. someone who learned to fight in the streets rather than being formally trained in the sport of boxing 2. an aggressive and violent young criminal 3. a cruel and brutal fellow. adj. 1. not given to gentleness or sentimentality 2. very difficult; severely testing stamina or resolution 3. physically toughened 4. substantially made or constructed 5. violent and lawless 6. feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad') 7. resistant to cutting or chewing 8. unfortunate or hard to bear 9. making great mental demands; hard to comprehend or solve or believe.
n. 1. someone who learned to fight in the streets rather than being formally trained in the sport of boxing 2. an aggressive and violent young criminal 3. a cruel and brutal fellow. adj. 1. not given to gentleness or sentimentality 2. very difficult; severely testing stamina or resolution 3. physically toughened 4. substantially made or constructed 5. violent and lawless 6. feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad') 7. resistant to cutting or chewing 8. unfortunate or hard to bear 9. making great mental demands; hard to comprehend or solve or believe. 
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151. Well, that's just their tough luck! It was their mistake.
152. Beneath its surface glitter, the fashion industry is a tough place to work in.
153. He has her support to fall back on when the going gets tough.
154. It's about time teachers started to get tough with bullies.
155. It was tough talk, coming from a man who had begun the year in a hospital bed.
156. She is a tough decision-maker who does not court popularity.
157. He stressed the government's readiness to take tough action against terrorists.
158. I know it's going to be tough, but I think I'm in with a sporting chance of winning.
159. The bags have tough exterior materials to protect against knocks, rain and dust.
160. The company is going through a tough time at the moment.
161. The men who work on the oil rigs are a tough bunch.
162. In negotiating you have to develop an instinct for when to be tough and when to make a deal.
163. The government has introduced some tough new laws on food hygiene.
164. The Government is being accused of double standards in the way it is so tough on law and order yet allows its own MPs to escape prosecution for fraud.
165. The company admitted that it had been a tough year.
166. The manifesto includes tough measures to tackle road congestion and environmental pollution.
167. It's counter-productive to be too tough: it just makes the staff resentful.
168. She didn't tell us she was coming[sentencedict.com], so if this screws up her plans that's just tough.
169. The family has had a tough time of it these last few months.
170. You have to be tough to be successful in politics.
171. They are calling for tough legislation to tackle this problem.
172. It was nip and tuck as to who would win the playoffs, but Denver's determination helped them to beat a tough Washington team.
173. He might be in his eighties but he's tough as old boots,(www.Sentencedict.com) that man.
174. Mike likes to make out that he's tough, but he's a pussy cat really.
175. This course is really tough, - sometimes I feeling like packing it all in.
176. All managers face tough decisions at one time or another.
177. Several governments have adopted tough new anti-terrorist legislation in the wake of the attacks.
178. It's rather tough on him falling ill just as he's about to go on holiday.
179. The flooring needs to be tough enough to withstand wear.
180. Even among seasoned mountaineers Pinnacle Ridge is considered quite a tough proposition.
More similar words: toughness, dough, though, enough, through, drought, ought to, roughly, a thought, as though, thorough, although, go through, all through, throughout, get through, even though, run through, fall through, put through, cut through, thoroughly, come through, look through, pull through, pass through, carry through, break through, deep in thought, follow through.