pitiless pitiless /ˈpɪtiːləs/

adjective

1. () Without mercy or pity  ( unpitying , remorseless , ruthless , pitiless )
   without mercy or pity
    An act of ruthless ferocity
   an act of ruthless ferocity
    A monster of remorseless cruelty
   a monster of remorseless cruelty
   
2. Deficient in humane and kindly feelings  ( pitiless , unkind )
   deficient in humane and kindly feelings