tough

making great mental demands; hard to comprehend or solve or believe

feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad')

“he was feeling tough after a restless night”

not given to gentleness or sentimentality

“a tough character”

resistant to cutting or chewing

very difficult; severely testing stamina or resolution

“the competition was tough”

someone who learned to fight in the streets rather than being formally trained in the sport of boxing

unfortunate or hard to bear

“a tough break”

violent and lawless

“tough street gangs”

physically toughened

“the tough bottoms of his feet”

an aggressive and violent young criminal

a cruel and brutal fellow