Emotionally hardened; unfeeling and indifferent to the suffering/feelings of others.
Having calluses, or relating to calluses.
Harsh or severe.
Difficult or demanding.
Stubborn or persistent; capable of stubbornness or persistence.
Strong and resilient; sturdy.
Undergoing plastic deformation before breaking.
Difficult to cut or chew.
Rugged or physically hardy.
Rowdy or rough.
Used to indicate lack of sympathy
A person who obtains things by force; a thug or bully.
To endure.
To toughen.