implacable

American  

[im-plak-uh-buhl, -pley-kuh-] / ɪmˈplæk ə bəl, -ˈpleɪ kə- /

adjective

1. not to be appeased, mollified, or pacified; inexorable.

   an implacable enemy.

   Synonyms:

   merciless, unbending, unappeasable

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implacable British  

/ ɪmˈplækəbəl /

adjective

1. incapable of being placated or pacified; unappeasable

2. inflexible; intractable

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Related Words

See inflexible.

Other Word Forms

• implacability noun
• implacableness noun
• implacably adverb

Etymology

Origin of implacable

First recorded in 1375–1425; late Middle English word from Latin word implācābilis. See im- ², placable

Example Sentences

But in its immensity, its implacable absoluteness, is a certain confusion between means and ends.

From The Wall Street Journal

“The real evils in war,” St. Augustine once wrote, are “love of violence, revengeful cruelty, fierce and implacable enmity, wild resistance, and the lust of power.”

From The Wall Street Journal

The book contains a warning to the BBC from an unnamed source who says William is an "implacable antagonist" and "has people on the case".

From BBC

After taking office, Cheney pursued with implacable vigor his vision of sweeping presidential authority—an idea known as the unitary executive.

From The Wall Street Journal

They call out the industry’s tired shapes, implacable business systems, and unsustainable waste, but in ways that celebrate imagination.

From The Wall Street Journal

Related Words

• inexorable
• intractable
• relentless
• ruthless
• uncompromising
• unforgiving
• unrelenting
• unyielding