IMPLA'CABLE, a. L. 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.
The King James Bible has stood its ground for nearly 400 years. However, during that time the English language has changed, and with it the meanings of some words it used. Here are more than 6,500 words whose definitions have changed since 1611.Wikipedia
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