Meaning of “cruel” - Learner’s Dictionary

cruel

adjective us uk /ˈkruːəl/ crueller, cruellest, crueler, cruelest
I can't understand how anyone could be so cruel.It's cruel to keep an animal chained up like that all the while.He was certainly a very cruel man.It was, said the judge, a cruel and calculated crime for which the only punishment was a life in prison.He would shout at the kids from time to time and get quite angry with them but he was never cruel.

B1 extremely unkind, or causing people or animals to suffer:

a cruel joke
Many people think hunting is cruel to animals.
cruelly adverb

(Definition of “cruel” from the Cambridge Learner’s Dictionary © Cambridge University Press)