Answer: ruthless

AnswerCrossword Clue
RUTHLESS

Without compassion

RUTHLESS

Cutthroat

RUTHLESS

Cruel.

RUTHLESS
Inexorable.
RUTHLESS
Cruel
RUTHLESSWithout pity
RUTHLESSStopping at nothing
RUTHLESSUnfeeling
RUTHLESSWhat the 1920s Yankees didn't want to be?
RUTHLESSShowing no mercy
RUTHLESSBoston Red Sox after 1919?
RUTHLESSCold-blooded