" implacability "

1: as in obduracy, pitilessness;

•  Synonyms : 

•  callousness,

•  hard-heartedness,

•  obduracy,

•  obdurateness,

•  pitilessness,

•  exactingness,

•  hardness,

•  harshness,

•  inflexibility,

•  rigidity,

•  rigidness,

•  rigor,

•  rigorousness,

•  severity,

•  sternness,

•  strictness,

•  stringency,

•  dourness,

•  gruffness,

•  asceticism,

•  austereness,

•  austerity,

•  monasticism,

•  determination,

•  firmness,

•  resolve,

•  steadfastness,

•  obstinacy,

•  stubbornness

•  Antonyms : 

•  flexibility,

•  gentleness,

•  laxness,

•  mildness,

•  forbearance,

•  indulgence,

•  kindness,

•  lenience,

•  patience,

•  softness,

•  tenderness,

•  tolerance,

•  responsiveness,

•  willingness,

•  compliance,

•  pliability,

•  pliancy

1: sticking to an opinion, purpose, or course of action in spite of reason, arguments, or persuasion;

  * e.g., " ... an implacable judge who knew in his bones that the cover-up extended to the highest levels of government "

•  Synonyms : 

•  adamant,

•  adamantine,

•  bullheaded,

•  dogged,

•  hard,

•  hard-nosed,

•  hardened,

•  hardheaded,

•  headstrong,

•  immovable,

•  inconvincible,

•  inflexible,

•  intransigent,

•  mulish,

•  obdurate,

•  obstinate,

•  opinionated,

•  ossified,

•  pat,

•  pertinacious,

•  perverse,

•  pigheaded,

•  self-opinionated,

•  self-willed,

•  stiff-necked,

•  stubborn,

•  unbending,

•  uncompromising,

•  unrelenting,

•  unyielding,

•  willful

•  Antonyms : 

•  acquiescent,

•  agreeable,

•  amenable,

•  compliant,

•  complying,

•  flexible,

•  pliable,

•  pliant,

•  relenting,

•  yielding

2: showing no signs of slackening or yielding in one's purpose;

  * e.g., " ... an implacable dedication to the proposition that everyone is entitled to a quality education "

•  Synonyms : 

•  determined,

•  dogged,

•  grim,

•  relentless,

•  unappeasable,

•  unflinching,

•  unrelenting,

•  unyielding

•  Antonyms : 

• (N/A)