1) Boston Red Sox after 1919 2) Cruel 3) Inexorable 4) Merciless 5) Pitiless 6) Remorseless 7) Stopping at nothing 8) Unmerciful 9) Unpitying 10) Without mercy or pity 11) Without pity or compassion 1) Brutal 2) Competitive 3) Cruel 4) Cutthroat 5) Determined 6) Dishonest 7) Dog eat dog 8) Evil 9) Harsh 10) Intolerant 11) Merciless 12) Nasty 13) Persistent 14) Pitiless 15) Remorseless 16) Take no prisoners 17) Unforgiving 18) Unkind 19) Unmerciful 20) Unpitying 21) Unsparing 
[horse] Ruthless (1864–1876) was an American Thoroughbred filly and a National Museum of Racing and Hall of Fame-inducted racehorse. She is best known as the winner of the inaugural Belmont Stakes. ==Early life== Owned and bred by Francis Morris of New York, and was foaled on Morris` farm at Throgg`s Neck, New York. Ruthless was sired by ...
• (a.) Having no ruth; cruel; pitiless.
[Adjective] Very hard and cruel.
Ruth'less adjective Having no ruth; cruel; pitiless. « Their rage the hostile bands restrain, All but the ruthless monarch of the main.» Pope. -- 
without pity or compassion; cruel; merciless: a ruthless tyrant.
[SAT terms] without mercy or pity[Literary terms] without mercy or pity