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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1. When the going gets tough, the tough get going. 
2. Toughdays don't last. Tough people do.
3. Life is tough, but I'm tougher.
4. It was a tough decision to make.
5. Elephants have a very tough hide.
6. The meat was as tough as old boots.
7. She touched its tough irregular surface.
8. This meat's so tough I can hardly chew it!
9. The overland route is across some really tough mountains.
10. She's been having a tough time of it lately.
11. These toys are made from tough plastic.
12. Remove the tough outer leaves before cooking.
13. Tough times never last, but tough people do.
14. The tough road often leads to the top.
15. It was a tough race.
16. He built up a reputation as a tough businessman.
17. Mrs Thatcher was a tough and uncompromising politician.
18. I've always been drawn to tough, gutsy women.
19. A spell of tough luck discouraged him.
20. It is a tough nut for him to crack.
21. Things were pretty tough at first.
22. It must be tough for you.
23. Polyurethane varnish provides a tough, scratch-resistant finish.sentencedict.com/tough.html
24. Tough glass is needed for windscreens.
25. He has a tough character.
26. She was a tough girl with rather an abrasive manner.
27. She's a tough lady.
28. The vote will enable the Prime Minister to push through tough policies.
29. Whoever wins the election is going to have a tough job getting the economy back on its feet.
30. He is a man with a reputation for being tough and unafraid of unpopular decisions.
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.