A person who obtains things by force; a thug or bully.

“They were doing fine until they encountered a bunch of toughs from the opposition.”

To endure.

To toughen.

Strong and resilient; sturdy.

“The tent, made of tough canvas, held up to many abuses.”

(of food) Difficult to cut or chew.

“To soften a tough cut of meat, the recipe suggested simmering it for hours.”

Rugged or physically hardy.

“Only a tough species will survive in the desert.”

Used to indicate lack of sympathy

“If you don't like it, tough!”