pitiless | sense examples, Usage and Definition from wordnet dictionary online

Adjective pitiless has 2 senses

pitiless, remorseless, ruthless, unpitying - without mercy or pity; "an act of ruthless ferocity"; "a monster of remorseless cruelty"
Antonym: merciful (indirect, via merciless)
pitiless, unkind - deficient in humane and kindly feelings
Antonym: humane (indirect, via inhumane)