implacable

From Middle English implācāble (“immitigable, unappeasable”)[1] from Old French implacable (“harsh, unrelenting; implacable”) (modern French implacable), from Latin implācābilis (“unappeasable, implacable; irreconcilable”), from im- (variant of in- (prefix meaning ‘not’)) + plācābilis (“placable; appeasing, moderating, pacifying, propitiating; acceptable”) (from plācō (“to assuage, pacify, placate; to appease; to reconcile”) + -bilis (suffix forming adjectives indicating a capacity or worth of being acted upon)).[2]

• (Received Pronunciation) IPA^(key): /ɪmˈplækəb(ə)l/, /-ˈpleɪ-/
• (General American) IPA^(key): /ɪmˈplækəbəl/
• Hyphenation: im‧pla‧ca‧ble

implacable (comparative more implacable, superlative most implacable)

1. Not able to be placated or appeased.

   Synonyms: impacable (obsolete), irreconcilable, unassuageable, unplacable (obsolete), unpleasable

   Antonyms: appeasable, assuageable, pacable, pacifiable, placable

   • c. 1601–1602, William Shakespeare, “Twelfe Night, or VVhat You VVill”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies (First Folio), London: Printed by Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358, [Act III, scene iv], page 269:

     He is knight dubb'd with vnhatche'd Rapier, and on carpet conſideration, but he is a diuell in priuate brall, soules and bodies hath he diuorc'd three, and his incenſement at this moment is ſo implacable, that ſatisfaction can be none, but by pangs of death and ſepulcher: Hob, nob, is his word: giu't or take't.

   • 1810, J[ohn] Stagg, “Arthur’s Cave. A Legendary Tale.”, in The Minstrel of the North: Or, Cumbrian Legends. […], London: Printed by Hamblin and Seyfang, […], for the author, and sold by J. Blacklock, […], OCLC 7000697, page 105:

     [I]n the reign of Henry the Second, a body happening, by chance, to be dug up near Glastonbury Abbey, without any symptoms of putrefaction or decay, the Welch, the descendants of the Ancient Britons, tenacious of the dignity and reputation of that illustrious hero [King Arthur], vainly supposed it could be no other than the body of their justly-boasted Pen-Dragon; and that he had been immured in that sepulchre by the spells of some powerful and implacable inchanter.

2. Impossible to prevent or stop; inexorable, unrelenting, unstoppable.

   Synonyms: relentless, unremitting, unyielding

   • 2011, James D. Hornfischer, “The Giants Ride”, in Neptune’s Inferno: The U.S. Navy at Guadalcanal, New York, N.Y.: Bantam Books, →ISBN; trade paperback edition, New York, N.Y.: Bantam Books, 2012, →ISBN, page 345:

     The battleships Washington and South Dakota pushed through the sea with an implacable ease.

3. Adamant; immovable.
   • 1678, John Bunyan, The Pilgrim’s Progress from This World, to That which is to Come: […], London: Printed for Nath[aniel] Ponder […], OCLC 228725984; reprinted in The Pilgrim’s Progress (The Noel Douglas Replicas), London: Noel Douglas, […], 1928, OCLC 5190338, page 84:

     Indeed Cain hated his Brother, becauſe his own works were evil, and his Brothers righteous; and if thy Wife and Children have been offended with thee for this, they thereby ſhew themſelves to be implacable to good; and thou haſt delivered thy ſoul from their blood.

• implacability
• implacableness
• implacably

From Latin implācābilis.

• (Balearic, Central) IPA^(key): /im.pləˈka.blə/
• (Valencian) IPA^(key): /im.plaˈka.ble/

implacable (masculine and feminine plural implacables)

1. implacable (not able to be placated or appeased)

• implacablement

• implacabilitat

• “implacable” in Diccionari de la llengua catalana, segona edició, Institut d’Estudis Catalans.

From Latin implācābilis.

• IPA^(key): /ɛ̃.pla.kabl/

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implacable (plural implacables)

1. implacable, harsh, unrelenting

• implacabilité
• implacablement

• “implacable” in le Trésor de la langue française informatisé (The Digitized Treasury of the French Language).

From Latin implācābilis.

• IPA^(key): /implaˈkable/, [ĩmplaˈkaβle]
• Hyphenation: im‧pla‧ca‧ble

implacable (plural implacables)

1. implacable, harsh, unrelenting

• implacablemente

• aplacar
• implacabilidad

• “implacable” in Diccionario de la lengua española, Vigésima tercera edición, Real Academia Española, 2014.