Without mercy (10)
'without mercy' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pitiless that I've seen before include "Without compassion or mercy" , "Harsh, cruel" , "Cold-hearted" , "Callous" , "Remorseless, ruthless" .)
'without mercy' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for relentless that I've seen before include "Uncompromising" , "sustained" , "Unyielding - implacable" , "Inexorable" , "Allowing no respite" .)