#1 tough a. not given to gentleness or sentimentality; "a tough character". wn
#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 tough a. [toughened] physically toughened; "the tough bottoms of his feet". wn
#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 tough s. [ruffianly] violent and lawless; "the more ruffianly element"; "tough street gangs". wn
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