RUTHLESS, RUTHLESSNESS
ADJECTIVES
1877 — IMPITEOUS ruthless, pitiless
1960 — DOWN AND DIRTY unprincipled, devious, viciously competitive; employing ruthless or aggressive tactics
NOUNS
1822 — DOG EAT DOG ruthless competition or self-interest
1990 — ICE courage, ruthlessness → African-American sl.
NOUNS – PERSON
1659 — MOLOCH a terrible or remorselessly destructive person; a cruel or ruthless person
1661 — MOLOCHSHIP a mock title for a cruel or ruthless person → obs.
1745 — RABIATOR — ROBIATOR — RUBIATOR a plunderer; a violent, ruthless person; a lout, a boor, a bully → Sc.
1791 — LADY MACBETH a remorseless or ruthless woman, esp. one who assists or controls a weak man
1825 — GALLAYNIEL a big, gluttonous, ruthless man → Sc. obs.
1885 — COWBOY a wild, rash, or reckless man; one who has little regard for rules or laws, or is impulsively violent or aggressive; a hot-headed, ruthless, or unrestrained criminal, esp. a gunman → sl., orig. US
1973 — GEMMIE a tough, ruthless young man → Sc. sl.
1981 — JUNKYARD DOG an aggressive, ruthless, or tenacious person, esp. a lawyer or government official
1982 — NUTCUTTER a ruthless person → US sl.
Lexicophilia 