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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121. He had shot three people dead earning himself a reputation as a tough guy.
122. She's had a really tough time the last year and a half.
123. Self - confident , ambitious and positive, Paula is a tough cookie who is bound to do well.
124. She told herself to be brave and tough it out .
125. He wants to be the tough rebel who bucks the system.
126. We've got a tough programme, hard work right through to the summer.
127. She won't last long in that job it's too tough.
128. She resents her mother for being so tough on her.
129. Mexican Indians used to wrap tough meat in leaves from the papaya tree.
130. Amateurs fall by the wayside when the going gets tough.
131. It was a tough race and I had to pace myself.
132. Work can get tough in the middle of a term but hang on in there and it'll be OK.
133. Whoever decides to take up the gauntlet and challenge the Prime Minister will have a tough battle.
134. He's a tough kid and he acts up a lot.
135. This case is going to be tough(sentencedict.com), but I promise I'll give it my best shot.
136. The resin from which the oil is extracted comes from a small, tough tree.
137. She's almost 90 but she's still as tough as old boots.
138. They gave me the tough job of telling applicants that they'd been rejected.
139. Her rather tough and worldly exterior hides a very soft and sensitive heart.
140. You need to be tough to survive in the jungle.
141. According to Mandy, Pat's tough exterior hides a shy and sensitive soul.
142. It's a difficult situation, but if we can just tough it out, things are bound to get better soon.
143. He was a tough politician who wasn't afraid to speak his mind.
143. Sentencedict.com is a online sentence dictionary, on which you can find good sentences for a large number of words.
144. The situation called for someone tough, and I was a complete marshmallow.
145. He may have softened a bit in his old age but he's still a tough nut.
146. The reporters were asking a lot of tough questions .
147. Are you sure you're physically tough enough for this job?
148. "It's tough at the top," he said. "It's tougher at the bottom," riposted the billionaire.
149. It's time you woke up to the fact that it's a tough world.
150. In this business you have to be tough , and the devil take the hindmost.
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.