tuff

noun

A light porous rock, now especially a rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel.

1. Strong and resilient; sturdy.

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

2. (of food) Difficult to cut or chew.

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

3. Rugged or physically hardy.

   Only a tough species will survive in the desert.

4. Stubborn.

   He had a reputation as a tough negotiator.

5. (of weather etc) Harsh or severe.
6. Rowdy or rough.

   A bunch of the tough boys from the wrong side of the tracks threatened him.

7. (of questions, etc.) Difficult or demanding.

   This is a tough crowd.

8. Undergoing plastic deformation before breaking.