(of the skin) made hard (by rough work etc)
cruel, insensitive
cruel; without moral feeling
animal
not humane
animal, savage
stubborn
pig-headed, stubborn
calm and unemotional (about trouble)
unemotional
having, covered with, many stones; hard, cold and unsympathetic
hard, icy in appearance, response
(especially) severe or harsh (in judging the conduct of others)
ungenerous
not ready, willing, to forgive
merciless
not sympathetic
without agreement in feeling