The definition of cruelty refers to unkind or mean acts, or indifference to someone's feelings or emotions.
(noun)Calling someone mean names is an example of cruelty.
See cruelty in Webster's New World College Dictionary
noun
Origin: ME cruelte < OFr < L crudelitas < cruel
See cruelty in American Heritage Dictionary 4
cru·el·ty
noun pl. cruelties cru·el·tiesLearn more about cruelty