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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91. I had set myself a tough assignment.
92. She's often been painted as a tough businesswoman.
93. When the chips are down, she's very tough.
94. It's tough being married to a cop.
95. He was having a really tough time at work.
96. Tough new safety standards have been introduced for cars.
97. I find his books pretty tough going .
98. California has adopted a tough stance on the issue.
99. They are very tough on drunk drivers.
100. Tweed is timeless, tactile and tough.
101. The meat was tough and flavourless.
102. He plays the tough guy in the movie.
103. The government has introduced tough new import restrictions.
104. Isn't the meat a trifle tough?
105. The film's budget dictated a tough schedule.
106. Stoneware is tough and cannot be scratched.
107. It was a tough but clean game.
108. The proposal faces tough opposition from powerful vested interests.
109. The final exam was a tough nut.
110. Jack is tough, but always straightforward and fair.
111. His record reveals a tough streak.
112. There are tough penalties for drinking and driving.
113. His approach had won him a reputation as a tough manager.
114. It's going to be a tough competition but I'm mentally prepared for it.
115. It strikes me that he's right a tough nut to crack.
116. Being able to afford a drink would be a comfort in these tough times.
117. After some tough bargaining(sentence dictionary), we finally agreed on a deal.
118. He wouldn't last five minutes in the police force - it's far too tough for him.
119. I soon realized that being tough was getting me nowhere fast .
120. You need to be pretty tough to succeed in the property world.
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.