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Webster's New World College Dictionary » implacable
implacable 
implacable definition
im·plac·able (im plak′ə bəl, -plā′kə-)
adjective
- not placable; that cannot be appeased or pacified; relentless; inexorable
- Rare that cannot be eased, lessened, or allayed
Etymology: Fr < L implacabilis
Related Forms:
- implacability im·plac′·a·bil′·ity noun
- implacably im·plac′·a·bly adverb
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