implacable

from WordNet (r) 3.0 (2006)
implacable
    adj 1: incapable of being placated; "an implacable enemy" [ant:
           {placable}]
    
from The Collaborative International Dictionary of English v.0.48
Implacable \Im*pla"ca*ble\, a. [L. implacabilis; pref. im- not +
   placabilis: cf. F. implacable. See {Placable}.]
   1. Not placable; not to be appeased; incapable of being
      pacified; inexorable; as, an implacable prince.
      [1913 Webster]

            I see thou art implacable.            --Milton.
      [1913 Webster]

            An object of implacable enmity.       --Macaulay.
      [1913 Webster]

   2. Incapable of being relieved or assuaged; inextinguishable.
      [R.]
      [1913 Webster]

            O! how I burn with implacable fire.   --Spenser.
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            Which wrought them pain
            Implacable, and many a dolorous groan. --Milton.

   Syn: Unappeasable; inexorable; irreconcilable; unrelenting;
        relentless; unyielding.
        [1913 Webster]
    
from Moby Thesaurus II by Grady Ward, 1.0
56 Moby Thesaurus words for "implacable":
      adamant, adamantine, avenging, cast-iron, cruel, dour, firm,
      flinty, grim, grudgeful, hard, hard-core, immovable, immutable,
      impliable, inelastic, inexorable, inflexible, intractable,
      intransigent, iron, irreconcilable, merciless, mortal, pitiless,
      punitive, punitory, rancorous, relentless, retaliatory, revanchist,
      revengeful, rigid, rigorous, rock-ribbed, ruthless, steely, stern,
      stiff, unaffected, unalterable, unappeasable, unbending,
      unchangeable, uncompassionate, uncompromising, unflinching,
      unforgiving, ungiving, unmoved, unrelenting, unsympathetic,
      unyielding, vengeful, vindicatory, vindictive

    

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