toughest
adjective
Definitions
Strong and resilient; sturdy.
Example: The tent, made of tough canvas, held up to many abuses.
(of food) Difficult to cut or chew.
Example: To soften a tough cut of meat, the recipe suggested simmering it for hours.
Rugged or physically hardy.
Example: Only a tough species will survive in the desert.
Stubborn.
Example: He had a reputation as a tough negotiator.