(of the skin) made hard (by rough work etc)

cruel, insensitive

fixed in position; (two or more people carrying on) a business

inflexible

regular, usual; having a habit mentioned

usual, established

solid and firm; not easy to bend, dent, cut etc

rocklike

(of a person) showing no sign of feeling

aloof, cool

not sorry for having done wrong

unrepentant

wicked (the more usual word)

not religious

(of a person, bad behaviour) that cannot be corrected

bad, hopeless

not sensitive (to touch, light, to the feelings of other people)

indifferent, callous

not easily agreeing to an argument or being persuaded; stubborn

stubborn, determined

not easily bent or changed in shape; hard to stir, work, move etc; formal, unfriendly; thoroughly; a dead body

hard, inflexible

having, covered with, many stones; hard, cold and unsympathetic

hard, icy in appearance, response

(of meat) hard to cut or get one's teeth into; not easily cut, broken or worn out; (of a person) strong; able to endure hardship; (of a person) rough and violent

sturdy, strong

not abashed

shameless

not anxious (about); not (emotionally) concerned (with)

carefree; apathetic

a person who has a lot of experience; a person who has been in the armed forces

experienced, seasoned

confirmed

confirmed