Synonyms of the word

callous

• adj. Emotionally hardened; unfeeling and indifferent to the suffering/feelings of others.
• adj. Having calluses.
• n. Alternative form of callus.

calloused

• adj. Having become or being made callous.

cauterise

• v. To burn, sear, or freeze tissue using a hot iron, electric current or a caustic agent.

cauterize

• v. (chiefly US spelling) To burn, sear, or freeze tissue using a hot iron, electric current or a caustic…

harden

• v. (intransitive) To become hard (tough, resistant to pressure).
• v. (transitive, ergative) To make something hard or harder (tough, resistant to pressure).
• v. (transitive, computing) To modify (a website or other system) to make it resistant to malicious attacks.
• v. (transitive, dated) To become or make (a person or thing) resistant or less sensitive.
• v. (phonology) To become or make (a consonant) more fortis.

indurate

• v. To harden or to grow hard.
• v. To make callous or unfeeling.
• v. To inure; to strengthen; to make hardy or robust.
• adj. Hardened, obstinate, unfeeling, callous.

insensitive

• adj. Not expressing normal physical feeling.
• adj. Not expressing normal emotional feelings; cold; tactless; undiplomatic.

inure

• v. (transitive) To cause (someone) to become accustomed (to something); to habituate.
• v. (intransitive, chiefly law) To take effect, to be operative.

pachydermatous

• adj. of or relating to the pachyderms.
• adj. thick-skinned, insensitive.

thickened

• v. simple past tense and past participle of thicken.

tough

• adj. Strong and resilient; sturdy.
• adj. (of food) Difficult to cut or chew.
• adj. Rugged or physically hardy.
• adj. Stubborn.
• adj. (of weather etc) Harsh or severe.
• adj. Rowdy or rough.
• adj. (of questions, etc.) Difficult or demanding.
• adj. (material science) Undergoing plastic deformation before breaking.
• interj. (slang) Used to indicate lack of sympathy.
• n. A person who obtains things by force; a thug or bully.
• v. To endure.
• v. To toughen.

toughened

• v. simple past tense and past participle of toughen.