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American Dictionary of the English Language

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Implacable


IMPLA'CABLE, adjective [French from Latin implacabilis; in and placabilis, from placo, to appease.]

1. Not to be appeased; that can not be pacified and rendered peaceable; inexorable; stubborn or constant in enmity; as an implacable prince.

2. Not to be appeased or subdued; as implacable anger; implacable enmity, malice or revenge.