ˈpid.]ēlə̇s, -it], ] ə l-\ adjective
Etymology: Middle English piteeles, from pitee, pite pity + -les -less
1.
a. : devoid of or unmoved by pity and compassion : showing no mercy : merciless
a pitiless dictator
b. archaic : exciting no pity or compassion
a corpse, dog-worried, pitiless — J.S.Phillimore
2. : grimly uncompromising
a pitiless acceptance of fact — H.G.Wells
the almost pitiless clarity of intelligence — P.E.More