Noah Webster's Dictionary 1. (a.) Not to be appeased; incapable of being pacified; inexorable; as, an implacable prince. 2. (a.) Incapable of being relieved or assuaged; inextinguishable.

Multi-Version Concordance Implacable (2 Occurrences) Romans 1:31 Without understanding, covenantbreakers, without natural affection, implacable, unmerciful: (KJV WBS YLT) 2 Timothy 3:3 without natural affection, implacable, slanderers, without self-control, fierce, no lovers of good, (ASV DBY YLT RSV)