Tougher

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."

Stubborn.

"He had a reputation as a tough negotiator."