- The definition of implacable is someone or something who cannot be calmed or made less angry.
An example of implacable is a screaming child who won't listen to reason.
- not placable; that cannot be appeased or pacified; relentless; inexorable
- Rare that cannot be eased, lessened, or allayed
Origin of implacableFrench ; from Classical Latin implacabilis
Origin of implacableMiddle English, from Old French, from Latin implācābilis : in-, not; see in–1 + plācābilis, placable; see placable.
(comparative more implacable, superlative most implacable)