1.Definition: feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad')
"He was feeling tough after a restless night"
2.Definition: making great mental demands; hard to comprehend or solve or believe
3.Definition: not given to gentleness or sentimentality
"A tough character"
4.Definition: physically toughened
"The tough bottoms of his feet"
5.Definition: resistant to cutting or chewing
6.Definition: substantially made or constructed
"A tough all-weather fabric", "Some plastics are as tough as metal"
7.Definition: unfortunate or hard to bear
"A tough break"
8.Definition: very difficult; severely testing stamina or resolution
"The competition was tough", "It's a tough life", "It was a tough job"
9.Definition: violent and lawless
"Tough street gangs"