definition of
tough

[1] #1 tough a. not given to gentleness or sentimentality; "a tough character". wn

[2] #2 tough s. [rugged] 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". wn

[3] #3 tough a. [toughened] physically toughened; "the tough bottoms of his feet". wn

[4] #4 tough s. [sturdy] substantially made or constructed; "sturdy steel shelves"; "sturdy canvas"; "a tough all-weather fabric"; "some plastics are as tough as metal". wn

[5] #5 tough s. [ruffianly] violent and lawless; "the more ruffianly element"; "tough street gangs". wn