extremely cruel

crude, savage

cruel and very unkind

cruel, remorseless

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

cruel, insensitive

(of a person) taking pleasure in causing pain to, watching the suffering of, others

vicious, pitiless; causing pain

(of a person) showing no sign of feeling

aloof, cool

having no interest or opinion; neither for nor against

unfeeling, uninterested

cruel; without moral feeling

animal

not humane

animal, savage

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

indifferent, callous

stubborn

pig-headed, stubborn

showing no pity

without mercy or care

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

hard, icy in appearance, response

more like an animal than a human being

hard

not ready, willing, to forgive

merciless

not showing kindness

not nice

not social; outside the usual working day

unfeeling, uninterested

not sympathetic

without agreement in feeling

(of a person, behaviour) wrong; immoral; very bad; mischievous

corrupt, bad