What is the meaning of Tough?

Of a material, strong and resilient; sturdy.

Of food, difficult to cut or chew.

Of a person or animal, rugged or physically hardy.

Of a person, stubborn or persistent; capable of stubbornness or persistence.

Of weather, harsh or severe.

Rowdy or rough.

Of a question, difficult or demanding.

Undergoing plastic deformation before breaking.

Strict, not lenient.

Used to indicate lack of sympathy

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

To endure.

To toughen.

alternative form of taff (“tough; robust; assertive and not overly sensitive”)

alternative form of tow

Source: wiktionary.org