tough

nouns

someone who learned to fight in the streets rather than being formally trained in the sport of boxing
an aggressive and violent young criminal

adjectives

not given to gentleness or sentimentality
"a tough character"
antonym
is similar to
tough and callous by virtue of experience
is similar to
facing facts or difficulties realistically and with determination
see also
dispassionate
"took a hard look"; "a hard bargainer";
see also
deficient in human sensibility; not mentally or morally sensitive
"insensitive to the needs of the patients"
very difficult; severely testing stamina or resolution
"a rugged competitive examination"; "the rugged conditions of frontier life"; "the competition was tough"; "it's a tough life"; "it was a tough job"
is derived from
physically toughened
"the tough bottoms of his feet"
antonym
substantially made or constructed
"sturdy steel shelves"; "sturdy canvas"; "a tough all-weather fabric"; "some plastics are as tough as metal"
violent and lawless
"the more ruffianly element"; "tough street gangs"
feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad')
"my throat feels bad"; "she felt bad all over"; "he was feeling tough after a restless night"
resistant to cutting or chewing
is derived from
antonym
is similar to
difficult to chew
is similar to
requiring much chewing
is similar to
resembling or made to resemble leather; tough but pliable
is similar to
(of meat) full of sinews; especially impossible to chew
is similar to
having or resembling fibers especially fibers used in making cordage such as those of jute
is similar to
having a relatively tough outer covering
see also
not suitable for food
unfortunate or hard to bear
"had hard luck"; "a tough break"
making great mental demands; hard to comprehend or solve or believe
"a baffling problem"; "I faced the knotty problem of what to have for breakfast"; "a problematic situation at home"
is derived from