Definitions from Wiktionary (tough)

▸ adjective:  (of a material) Strong and resilient; sturdy.
▸ adjective:  (of food) Difficult to cut or chew.
▸ adjective:  (of a person or animal) Rugged or physically hardy.
▸ adjective:  (of a person) Stubborn or persistent; capable of stubbornness or persistence.
▸ adjective:  (of weather, etc.) Harsh or severe.
▸ adjective:  Rowdy or rough.
▸ adjective:  (of questions, etc.) Difficult or demanding.
▸ adjective:  (material science) Undergoing plastic deformation before breaking.
▸ adjective:  Strict, not lenient.
▸ noun:  A person who obtains things by force; a thug or bully.
▸ verb:  To endure.
▸ verb:  To toughen.
▸ Also see tough

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