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Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Impossible to placate or appease: implacable foes; implacable suspicion.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Not able to be placated or appeased.
  • adj. Adamant; immovable.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not placable; not to be appeased; incapable of being pacified; inexorable.
  • adj. Incapable of being relieved or assuaged; inextinguishable.

from The Century Dictionary and Cyclopedia

  • Not placable; not to be appeased; not to be pacified or reconciled; inexorable: as, an implacable prince; implacable malice.
  • Not to be relieved or assuaged.
  • Synonyms Relentless, etc. (see inexorable), unappeasable, unforgiving, vindictive, pitiless, rancorous.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. incapable of being placated

Etymologies

Middle English, from Old French, from Latin implācābilis : in-, not; see in-1 + plācābilis, placable; see placable.
(American Heritage® Dictionary of the English Language, Fourth Edition)
im- +‎ placable (Wiktionary)

Examples

  • So implacable is his revenge that he sends a party of soldiers into Egypt, some hundreds of miles, and they bring him back by force of arms.

    Commentary on the Whole Bible Volume IV (Isaiah to Malachi)

  • Allegra’s tone was neutral, her expression implacable.

    The Home for Broken Hearts

  • “Well, that’s as may be, Lady Nell, but it’s not right,” Linton declared, her arms folded, her expression implacable.

    A Wicked Gentleman

  • Rue Murillo, or in the tent at Croisset; he has recalled the implacable didactics of his old master, his tender brutality, the paternal advice of his generous and candid heart.

    Une Vie

  • The doctrine is optimistic; and whoever has a generous faith in humanity will have no fault to find with the absence of the idea of implacable evil from its teaching.

    Kokoro Japanese Inner Life Hints

  • Rather, "Unless haply Thou hast utterly rejected us, and art beyond measure wroth against us," that is, Unless Thou art implacable, which is impossible, hear our prayer [Calvin].

    Commentary Critical and Explanatory on the Whole Bible

  • Murillo, or in the tent at Croisset; he has recalled the implacable didactics of his old master, his tender brutality, the paternal advice of his generous and candid heart.

    Complete Original Short Stories of Guy De Maupassant

  • They were also afraid of introducing a new party into the convention, already divided, and of recalling implacable enemies, who might cause, with regard to themselves, a reaction similar to that which had taken place against the old committees.

    History of the French Revolution from 1789 to 1814

  • State President F W de Klerk and "leaders of interest groups in the community" to discuss its "implacable" demand for self-determination.

    ANC Daily News Briefing

  • In the course of two pages full of shoddy implications and unsubstantiated suggestions, Ms. Grosskurth evokes an "implacable" Freud, scurrilous, petty and power-seeking, so malevolent that he is the uncaring perpetrator and concealer of his patient's supposed suicide, so bereft of intelligence that one wonders why the twentieth century, let alone a journal of the NYR's calibre, has bothered with him at all.

    Schadenfreud

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