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Definition of implacable:

  1. Incapable of ebign relieved or assuaged; inextinguishable.
  2. Not placable; not to be appeased; incapable of being pacified; inexorable; as, an implacable prince.


mulish, unmitigable, opinionated, hard-nosed, remorseless, bloody-minded, hard, stern, stiff-necked, study at inflexible, obdurate, closed, inconvincible, relentless, pigheaded, die-hard, narrow-minded, intransigent, unforgiving, remorseless, iron, inflexible, self-opinionated, narrow, inexorable, conservative, adamant, unrelenting, vindictive, cruel, self-willed, hardheaded, pertinacious, adamantine, brassbound, uncompliant, incompliant, unbendable, ossified, immovable, perverse, pat, hardened, rigid, resist, inflexible, unappeasable, willful, grim, intolerant.

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