2 synonym groups for Merciless

merciless, ruthless, unrelenting, pitiless, unsympathetic, harsh, severe, callous, cold-hearted, unfeeling, hard-hearted, implacable, inexorable, remorseless, unmerciful, unforgiving, stern, cruel, brutal, relentless, uncompassionate, inhumane, heartless, indifferent, uncharitable, stony-hearted, unkind, iron-hearted, cold, grim, unyielding, adamant, unbending, unremitting, unpardonable, unappeasable, unplacable, unrelentless [x]

merciless, pitiless, cruel, heartless, brutal, callous, remorseless, unfeeling, unsparing, inhumane, savage, fierce, relentless, implacable, uncompassionate, unforgiving, unmerciful, cold-blooded, hard-hearted, iron-hearted, stone-hearted, harsh, severe, stern, grim, unrelenting, unyielding, ruthless [x]